{"id":20418,"date":"2026-05-14T15:26:22","date_gmt":"2026-05-14T13:26:22","guid":{"rendered":"https:\/\/tera-environnement.com\/caractair-project-a-new-approach-to-long-term-sampling-of-soil-gases-and-indoor-air\/"},"modified":"2026-05-27T14:15:00","modified_gmt":"2026-05-27T12:15:00","slug":"caractair-project-a-new-approach-to-long-term-sampling-of-soil-gases-and-indoor-air","status":"publish","type":"post","link":"https:\/\/tera-environnement.com\/en\/caractair-project-a-new-approach-to-long-term-sampling-of-soil-gases-and-indoor-air\/","title":{"rendered":"CARACTAIR project: a new approach to long-term sampling of soil gases and indoor air"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"20418\" class=\"elementor elementor-20418 elementor-20241\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8d5069d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8d5069d\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-abaae19\" data-id=\"abaae19\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-162cbc6 elementor-widget__width-auto elementor-widget elementor-widget-image\" data-id=\"162cbc6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"68\" height=\"69\" src=\"https:\/\/tera-environnement.com\/wp-content\/uploads\/2023\/09\/fleche-grise.png\" class=\"attachment-large size-large wp-image-389\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ca79a8e elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"ca79a8e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">CARACTAIR project: a new approach to long-term sampling of soil gases and indoor air<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-053cbdc e-flex e-con-boxed e-con e-parent\" data-id=\"053cbdc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f6dd59e elementor-widget elementor-widget-spacer\" data-id=\"f6dd59e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e0b3406 e-con-full e-flex e-con e-parent\" data-id=\"e0b3406\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a0a0fb4 elementor-widget elementor-widget-text-editor\" data-id=\"a0a0fb4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>TERA Environnement&#8217;s contribution to the CARACTAIR project for enhanced indoor air quality assessment at contaminated sites<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d7a3114 e-flex e-con-boxed e-con e-parent\" data-id=\"d7a3114\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-44326a1 elementor-widget elementor-widget-text-editor\" data-id=\"44326a1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"TextRun SCXW230638358 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW230638358 BCX8\">TERA Environnement took part in the <a href=\"https:\/\/librairie.ademe.fr\/urbanisme-territoires-et-sols\/8217-projet-caractair.html#\" target=\"_blank\" rel=\"noopener\">CARACTAIR research project<\/a><\/span><span class=\"NormalTextRun SCXW230638358 BCX8\">, funded by ADEME as part of the <a href=\"https:\/\/recherche.ademe.fr\/programmes-de-recherche\/gesipol\" target=\"_blank\" rel=\"noopener\">GESIPOL program<\/a><\/span><span class=\"NormalTextRun SCXW230638358 BCX8\">, alongside <a href=\"https:\/\/www.ginger-burgeap.com\/en\/\" target=\"_blank\" rel=\"noopener\">GINGER BURGEAP<\/a><\/span> <span class=\"NormalTextRun SCXW230638358 BCX8\">and <a href=\"https:\/\/imt-nord-europe.fr\/en\/\" target=\"_blank\" rel=\"noopener\">IMT Nord Europe<\/a><\/span><span class=\"NormalTextRun SCXW230638358 BCX8\">. The aim of this project was to improve the assessment of pollution from soil gases and its impact on indoor air quality in buildings.<\/span><\/span><span class=\"EOP Selected SCXW230638358 BCX8\" data-ccp-props=\"{}\"> <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-765b4e3 e-con-full e-flex e-con e-parent\" data-id=\"765b4e3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ac6468c elementor-widget elementor-widget-text-editor\" data-id=\"ac6468c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong><span lang=\"FR-FR\" data-contrast=\"auto\">Soil gases: an invisible source of pollution <\/span><\/strong><span style=\"font-weight: bolder;\">and their transfer into indoor air<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-12aa9ce e-flex e-con-boxed e-con e-parent\" data-id=\"12aa9ce\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-239c7e8 elementor-widget elementor-widget-text-editor\" data-id=\"239c7e8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Soil gases refer to the gaseous fraction present in the soil pores. <\/p><p>They consist of: <\/p><ul><li>gases naturally present in the soil (oxygen, nitrogen, carbon dioxide, etc.) <\/li><li>water vapor <\/li><li>and sometimes volatile pollutants resulting from contamination of the subsoil or groundwater <\/li><\/ul><p>When soil or groundwater is contaminated with volatile substances (hydrocarbons, chlorinated solvents, benzene, etc.), some of these pollutants may evaporate. <\/p><p>These compounds then migrate into the soil in gaseous form: these are soil gases. <\/p><p>They can then: <\/p><ul><li>stay in the basement <\/li><li>spread outward<\/li><li>seep into the buildings through: cracks in the slabs; utility penetrations; crawl spaces; or leaks <\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4d260f8 e-con-full e-flex e-con e-parent\" data-id=\"4d260f8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0d7812c elementor-widget elementor-widget-image\" data-id=\"0d7812c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"756\" height=\"360\" src=\"https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Origines-et-localisation-des-transferts-de-pollutions-volatiles-du-sol-vers-lair-interieur.png\" class=\"attachment-large size-large wp-image-20255\" alt=\"\" srcset=\"https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Origines-et-localisation-des-transferts-de-pollutions-volatiles-du-sol-vers-lair-interieur.png 756w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Origines-et-localisation-des-transferts-de-pollutions-volatiles-du-sol-vers-lair-interieur-300x143.png 300w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Origines-et-localisation-des-transferts-de-pollutions-volatiles-du-sol-vers-lair-interieur-600x286.png 600w\" sizes=\"(max-width: 756px) 100vw, 756px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-799fb97 e-flex e-con-boxed e-con e-parent\" data-id=\"799fb97\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c230a21 elementor-widget elementor-widget-text-editor\" data-id=\"c230a21\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center;\"><em>Sources and pathways of transfer of volatile pollutants from soil to indoor air. (Source: CARACTAIR Project report) <\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7b2c4ee e-flex e-con-boxed e-con e-parent\" data-id=\"7b2c4ee\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-88bc5d9 e-con-full e-flex e-con e-child\" data-id=\"88bc5d9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-35fb718 elementor-widget elementor-widget-spacer\" data-id=\"35fb718\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e96cae1 elementor-widget elementor-widget-text-editor\" data-id=\"e96cae1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Since we spend more than 80% of our time indoors, <a href=\"https:\/\/www.auvergne-rhone-alpes.developpement-durable.gouv.fr\/qualite-de-l-air-interieur-qai-r3290.html\" target=\"_blank\" rel=\"noopener\">air quality becomes a major public health issue.<\/a><\/p><p>Many sources can degrade indoor air quality, including combustion-based heating appliances, cooking systems, building materials, furniture, and smoking. Another source of pollution\u2014less obvious but just as significant\u2014is the intrusion of volatile pollutants from the soil and groundwater through soil gases.  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5532c58 e-con-full e-flex e-con e-child\" data-id=\"5532c58\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-752182b elementor-widget elementor-widget-image\" data-id=\"752182b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"534\" src=\"https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/iStock-1308888011-1024x683.jpg\" class=\"attachment-large size-large wp-image-20247\" alt=\"QAI Actu Caractair\" srcset=\"https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/iStock-1308888011-1024x683.jpg 1024w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/iStock-1308888011-300x200.jpg 300w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/iStock-1308888011-768x512.jpg 768w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/iStock-1308888011-1536x1025.jpg 1536w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/iStock-1308888011-scaled.jpg 2048w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/iStock-1308888011-600x400.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2d2a746 e-flex e-con-boxed e-con e-parent\" data-id=\"2d2a746\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c265642 elementor-widget elementor-widget-text-editor\" data-id=\"c265642\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In the context of contaminated sites and soils, it is therefore recommended to conduct measurement campaigns for soil gas, indoor air, and ambient air (<a href=\"https:\/\/www.boutique.afnor.org\/en-gb\/standard\/nf-iso-18400204\/soil-quality-sampling-part-204-guidance-on-sampling-of-soil-gas\/fa184952\/63234\" target=\"_blank\" rel=\"noopener\">NF ISO 18400-204<\/a>, BRGM-INERIS, 2016), in order to assess the transfer of pollutants into buildings and the risks to occupants. However, commonly used sampling techniques often rely on limited durations, which do not always accurately represent long-term exposures. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-36a9e51 e-con-full e-flex e-con e-parent\" data-id=\"36a9e51\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-331ebc8 elementor-widget elementor-widget-text-editor\" data-id=\"331ebc8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"TextRun SCXW178266079 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW178266079 BCX8\"><span class=\"TextRun SCXW29793566 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW29793566 BCX8\">Development of methods that better reflect long-term exposure<\/span><\/span><\/span><\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-403c9d9 e-flex e-con-boxed e-con e-parent\" data-id=\"403c9d9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7296538 elementor-widget elementor-widget-text-editor\" data-id=\"7296538\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"TextRun SCXW64724228 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW64724228 BCX8\">The project led to the development of an innovative method for long-term sampling of soil gas and indoor air. This approach, which relies on low-flow sampling over periods of up to several weeks, provides a more accurate representation of occupants\u2019 chronic exposure and improves the reliability of assessments at contaminated sites. <\/span><\/span><span class=\"EOP Selected SCXW64724228 BCX8\" data-ccp-props=\"{}\"> <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e06f20b e-con-full e-flex e-con e-parent\" data-id=\"e06f20b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d65b25b elementor-widget elementor-widget-text-editor\" data-id=\"d65b25b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"TextRun SCXW178266079 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW178266079 BCX8\"><span class=\"TextRun SCXW29793566 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW29793566 BCX8\"><span class=\"TextRun SCXW81272083 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW81272083 BCX8\">Modeling soil-to-indoor-air transfer incorporating biodegradation<\/span><\/span><\/span><\/span><\/span><\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-31b96cd e-flex e-con-boxed e-con e-parent\" data-id=\"31b96cd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a148591 elementor-widget elementor-widget-text-editor\" data-id=\"a148591\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"TextRun SCXW64724228 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW64724228 BCX8\"><span class=\"TextRun SCXW251928891 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW251928891 BCX8\">The partners have also developed an analytical modeling tool that incorporates the aerobic biodegradation of hydrocarbons. This advancement makes it possible to refine the assessment of pollutant transfer between soil and indoor air and to improve health risk assessments <\/span><\/span>.<\/span><\/span><span class=\"EOP Selected SCXW64724228 BCX8\" data-ccp-props=\"{}\"> <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0d05dc5 e-con-full e-flex e-con e-parent\" data-id=\"0d05dc5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8f88505 elementor-widget elementor-widget-text-editor\" data-id=\"8f88505\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"TextRun SCXW178266079 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW178266079 BCX8\"><span class=\"TextRun SCXW29793566 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW29793566 BCX8\"><span class=\"TextRun SCXW81272083 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW81272083 BCX8\"><span class=\"TextRun SCXW239627302 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW239627302 BCX8\">Validation of methods and recommendations derived from field measurement campaigns<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7cb0333 e-flex e-con-boxed e-con e-parent\" data-id=\"7cb0333\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-d5d2967 e-con-full e-flex e-con e-child\" data-id=\"d5d2967\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f0d79d9 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"f0d79d9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"665\" height=\"1024\" src=\"https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Photo-CARACTAIR-prelevements-665x1024.jpg\" class=\"attachment-large size-large wp-image-20328\" alt=\"\" srcset=\"https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Photo-CARACTAIR-prelevements-665x1024.jpg 665w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Photo-CARACTAIR-prelevements-195x300.jpg 195w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Photo-CARACTAIR-prelevements-768x1183.jpg 768w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Photo-CARACTAIR-prelevements-997x1536.jpg 997w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Photo-CARACTAIR-prelevements-600x924.jpg 600w, https:\/\/tera-environnement.com\/wp-content\/uploads\/2026\/05\/Photo-CARACTAIR-prelevements.jpg 1124w\" sizes=\"(max-width: 665px) 100vw, 665px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d2a69b0 e-con-full e-flex e-con e-child\" data-id=\"d2a69b0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-90d92e8 elementor-widget elementor-widget-spacer\" data-id=\"90d92e8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-763b06f e-con-full e-flex e-con e-child\" data-id=\"763b06f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ffe9536 elementor-widget elementor-widget-spacer\" data-id=\"ffe9536\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-33c9a55 elementor-widget elementor-widget-text-editor\" data-id=\"33c9a55\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span data-contrast=\"auto\">The research was tested at two experimental sites contaminated with hydrocarbons and chlorinated solvents. Measurement campaigns were conducted in soil gas, subsurface air, and indoor air within buildings<a href=\"https:\/\/librairie.ademe.fr\/urbanisme-territoires-et-sols\/8217-projet-caractair.html\" target=\"_blank\" rel=\"noopener\"> (CARACTAIR, p.13-20)<\/a>, to characterize the transfer of pollutants from the soil into occupied spaces. <\/span><span data-ccp-props=\"{}\"> <\/span><\/p><p><span data-contrast=\"auto\">These campaigns made it possible to validate the methods developed and to provide practical recommendations for the assessment and management of existing buildings.<\/span><span data-ccp-props=\"{}\"> <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c3cd01e e-con-full e-flex e-con e-parent\" data-id=\"c3cd01e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6d6e456 elementor-widget elementor-widget-text-editor\" data-id=\"6d6e456\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"TextRun SCXW178266079 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW178266079 BCX8\"><span class=\"TextRun SCXW29793566 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW29793566 BCX8\"><span class=\"TextRun SCXW81272083 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW81272083 BCX8\"><span class=\"TextRun SCXW239627302 BCX8\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW239627302 BCX8\">Analytical report by TERA Environment and development of sampling solutions for soil gases and indoor air <\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ee8cd82 e-flex e-con-boxed e-con e-parent\" data-id=\"ee8cd82\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b419c48 elementor-widget elementor-widget-text-editor\" data-id=\"b419c48\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>TERA Environnement contributed to the project, particularly in the following areas:<\/p>\n<ul>\n<li>Analytical development of the method for the various target pollutants (hydrocarbons and chlorinated solvents)<\/li>\n<li>Analysis of laboratory breakdown tests<\/li>\n<li>Analysis of samples collected at two actual sites<\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">The results of the CARACTAIR project represent a significant step forward in the management of contaminated sites and the assessment of indoor air quality, offering innovative and practical tools for professionals in the field.<\/span><span data-ccp-props=\"{}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">TERA Environnement offers sampling media for long-term, low-flow soil gas sampling (5mL\/min ranging from 7 days to several weeks) using 800\/200 mg activated carbon tubes for hydrocarbons and chlorinated solvents (LOQ of approximately <\/span>20\u00b5g\/m<sup>3 <\/sup><span data-contrast=\"auto\">for 1 month of sampling).&nbsp;<\/span><span data-ccp-props=\"{}\">&nbsp;<\/span><\/p>\n<p><span data-contrast=\"auto\">For indoor air quality (IAQ) measurements, a sampling method has been developed using&nbsp;triple-bed adsorbent tubes for continuous sampling ranging from 7 days to 4 or even 6 weeks at a flow rate of 5 mL\/min. This method is&nbsp;ideal&nbsp;for measuring benzene, toluene, ethylbenzene, and naphthalene, and is very effective for measuring hexane, heptane, and xylene. <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-337ffa8 e-con-full e-flex e-con e-child\" data-id=\"337ffa8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cc6f9ee elementor-widget elementor-widget-text-editor\" data-id=\"cc6f9ee\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p align=\"justify\"><span lang=\"fr-FR\"><b><strong>For more information on these long-term sampling techniques, please contact us.<\/strong><\/b><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f071495 e-con-full e-flex e-con e-parent\" data-id=\"f071495\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-7ba88b1 e-flex e-con-boxed e-con e-child\" data-id=\"7ba88b1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7819dc1 elementor-widget elementor-widget-text-editor\" data-id=\"7819dc1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p align=\"justify\"><span lang=\"fr-FR\"><b><strong>Explore our range of services, including testing, specimen collection kit supply, and equipment rental.<\/strong><\/b><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1427dfb e-flex e-con-boxed e-con e-child\" data-id=\"1427dfb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-afa7c56 e-flex e-con-boxed e-con e-child\" data-id=\"afa7c56\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f5b6ba4 buton elementor-widget elementor-widget-button\" data-id=\"f5b6ba4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/tera-environnement.com\/en\/air-analysis\/indoor-air\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Air analyses<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-655435c buton elementor-widget elementor-widget-button\" data-id=\"655435c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/tera-environnement.com\/en\/rental\/samplers\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Sampling media<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fca6bf5 buton elementor-widget elementor-widget-button\" data-id=\"fca6bf5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/tera-environnement.com\/en\/rental\/monitoring-stations\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Monitoring stations<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d46eb77 e-flex e-con-boxed e-con e-child\" data-id=\"d46eb77\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7e6d234 elementor-widget elementor-widget-text-editor\" data-id=\"7e6d234\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p align=\"justify\"><span lang=\"fr-FR\"><b><strong>Do you have any questions or do you need a quote? 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The aim of this project was to improve the assessment of pollution from soil [&hellip;]<\/p>\n","protected":false},"author":42,"featured_media":20247,"comment_status":"closed","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-20418","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CARACTAIR Project: Long-term sampling, soil gas, and indoor air<\/title>\n<meta name=\"description\" content=\"TERA Environnement&#039;s participation in the CARACTAIR project: long-term sampling of soil gases and indoor air\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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