The link between air pollution and autoimmune diseases just got a little clearer thanks to a massive study that dove into the health records of over 6 million Canadians.
, Naizhuo Zhao and fellow researchers at McGill University analyzed the healthInferring people's air pollution exposure from their postcode, they found a positive association between autoimmune disease onset and particulate matter in air pollution – specifically, fine particles sized 2.5 micrometers or less, called PMPeople in the study had health records spanning at least four years , during which time around 32,200 people were diagnosed with a systemic autoimmune disease.
The researchers adjusted for age, sex, socioeconomic status, and whether people lived in urban or rural areas. Controlling for smoking habits did not alter the findings. While the increased risk of autoimmune disease with air pollution exposure was slight, what's concerning is that Quebec generally has air pollution levels well below the air quality standards enforced by the Canadian government. Which is another way of saying even 'low' levels of air pollution seem to be harmful to health.No clear association was found between ozone exposure and the onset of autoimmune diseases in this study.
"We should [also] note that, in using administrative health data, we are only studying individuals who have presented for health care,"It's important to remember too that a host of other factors are entangled in autoimmune diseases, including genetics, diets of
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