Bryan Johnson· Author
The study found that exposure to Nitrogen Oxide (NO2) and fine particulate matter (PM2.5) at each age (1,4 and 6 years) was correlated to increased prevalence of peanut allergy at that age.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
The study found that exposure to Nitrogen Oxide (NO2) and fine particulate matter (PM2.5) at each age (1,4 and 6 years) was correlated to increased prevalence of peanut allergy at that age.
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Most importantly, children with coinciding peanut allergy and high exposure to NO2 or PM2.5 at the age of one had almost 2-times the risk of developing a persistent allergy (as seen at the age of 10), compared to having a peanut allergy at 1-year of age without the air pollution exposure, no such correlation was observed for egg or sesame allergies.
So there's a study that shows that early exposure to air pollution may double the risk of a peanut allergy becoming persistent by age 10.