Environmental Exposures · PFAS, Air & Plastics

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Heart
Fine particulate matter (PM2.5) harms more than the lungs: pooled large population studies find that people who breathe dirtier air over the long term have more cardiovascular disease and more deaths, an observed association. By mechanism, the particles stir up oxidative stress and inflammation, damage the inner lining of blood vessels and make blood clot more easily. The 2021 World Health Organization (WHO) guideline lowered the annual PM2.5 guideline value to 5 micrograms per cubic metre, meaning lower is better.
Respiratory
The smaller the particle, the more easily it slips past the layered defences of the nose and airways and reaches the alveoli deep in the lung, and the finest fraction may cross the alveolar wall into the blood. Burnett 2018 estimated with a model that long-term exposure to outdoor PM2.5 is linked to a large number of deaths worldwide.

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Three routes into the body

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Most harmful substances in the environment do not knock you down in one dose. They get in a little every day, for years, and build up slowly. The two stories you mostly meet online, the scare that "everything is toxic" and the sales pitch for a "detox program", are both far from this plain fact.

Split it into three routes you can act on and it becomes clear: whether your drinking water carries PFAS (a large family of man-made fluorinated chemicals that barely break down), how much PM2.5 (fine particles less than 2.5 micrometers across) is in the air you breathe, and the plastic you touch and eat from, together with the additives it carries. You cannot bring exposure to zero, but each route has a few cheap, effective moves that lower how much gets into your body.

Why those moves work, and why detox does not, both come down to a clearance pipeline the body already has: the same pipeline gets stuck at a different point on each of the three routes.

Educational content, not medical advice — consult a clinician.

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