Are homes in the Gironde region contaminated by smoke from the wildfires?

Les violents feux de forêt qui frappent régulièrement la Gironde et le massif des Landes de Gascogne laissent derrière eux un paysage dévasté et d'immenses panaches de fumée. Si le danger immédiat des flammes s'éloigne une fois l'incendie maîtrisé, une menace invisible et persistante plane sur les habitations riveraines : de nombreux logements se retrouvent contaminés par les fumées de combustion. Pénétrant au cœur des habitations par la VMC, les micro-fissures ou lors des phases d'évacuation, ces émanations déposent des résidus chimiques toxiques qu'il est indispensable d'évaluer pour garantir la sécurité sanitaire des habitants.

PAHs: The Major Toxins in Forest Fire Smoke

When wood, pignadas, and Mediterranean or Landes vegetation are incompletely burned, a multitude of heavy pollutants are released. Among these, polycyclic aromatic hydrocarbons (PAHs) are the most concerning group of toxic substances.

What are PAHs?

PAHs comprise several dozen organic chemical compounds formed at very high temperatures during a forest fire. Carried by soot and microparticles, they settle as fine particulate matter on all interior surfaces.

What are their health effects?

Exposure—even indirect or chronic—to areas contaminated by smoke containing PAHs poses significant risks:

Carcinogenic and mutagenic properties: Several PAHs, including benzo[a]pyrene, are classified as known or suspected carcinogens by the International Agency for Research on Cancer (IARC).

Respiratory irritation and diseases: Continuous inhalation of soot particles causes inflammation of the airways, triggers asthma attacks, and exacerbates chronic bronchial diseases (COPD).

Systemic toxic effects: PAHs cross the skin and lung barriers, affecting the immune system and posing reproductive toxicity risks.

Deep-seated, long-lasting indoor contamination

Many residents mistakenly believe that prolonged ventilation is sufficient to clean the air in a home after a toxic cloud has passed through. In reality, when homes have been contaminated by smoke, soot particles and PAHs do not remain suspended in the air in gaseous form.

They settle quickly and adhere strongly to porous materials as well as to all surfaces in the fireplace:

• Furnishings (rugs, curtains, sofas, mattresses)
• Paint, plaster, and wallpaper
• Ventilation and air conditioning systems
• Floors (hardwood, tile) and furniture

Every time you walk across the floor, sweep it, or use an unsuitable vacuum cleaner, this PAH-laden dust is continually stirred up, perpetuating harmful secondary pollution on a daily basis.

How can you tell if your home needs to be decontaminated?

Objectively determining whether your living spaces are contaminated by smoke to a critical level is an essential step before considering reoccupancy or undertaking specialized cleanup work. The smell of burning may sometimes fade, even though the concentration of PAHs in the dust remains dangerously high.

To address this critical public health issue, Scan4Toxic offers a specialized testing kit designed to accurately measure PAH contamination levels.

Easy sample collection with the Scan4Dust collector

The diagnosis is based on an analysis of dust collected in the home:

Easy sample collection: Thanks to the patented Scan4Dust device included in the test kit, you can collect a dust sample from your floors and furniture in just a few minutes using a standard vacuum cleaner.

Secure shipping: Place the sample in the included prepaid envelope to be sent directly to the laboratory.

Reliable results analyzed by experts

In the laboratory, the samples undergo rigorous analysis using gas chromatography coupled with mass spectrometry (GC-MS). This highly precise method makes it possible to individually identify and quantify each PAH molecule present.

You will then receive a comprehensive and clear report prepared by indoor air quality experts. It will indicate whether your home is among those heavily contaminated by smoke and provide concrete recommendations on whether a professional decontamination process is necessary to protect your family’s health.