“There’s no threshold for the association between particulate matter and mortality.” Nigeria
In the world’s largest ever study of toxic air, researchers analysed levels of pollution in 652 cities across 24 countries and regions.
It comes after three damning scientific papers published yesterday warned pollution also raises the risk of depression, bipolar disorder and blindness. The study, which appears in PLOS Biology, used data from the United States and Denmark to uncover the possible link between environmental pollution and psychiatric disorders.
There are a multitude of potential causes, including genetics as well as life experiences, so it is not possible to exclude environmental factors. The team then looked at healthcare data. For the U.S., they accessed a health insurance database that included claims that more than 151 million individuals made between 2003 and 2013.
Also, air pollution’s deadly effects on health are well known, but scientists now fear it could turn some people into violent offenders. Meanwhile, a major study suggests air pollution nearly doubles the risk of suffering a debilitating form of visual impairment. Last year scientists revealed they had found tiny particles of vehicle soot in the womb of pregnant women, suggesting even unborn babies are at risk.
The academics stressed their study did not look at the biological link between pollution and eye problems – merely the statistical odds linking the two. “Notably, the retina is also a part of the central nervous system which is biologically reasonable to be vulnerable to nitrogen dioxide intoxication.”
He says, “This study on psychiatric disorders is counterintuitive and generated considerable resistance from reviewers.” “Despite analyses involving large datasets,” he adds, “the available evidence has substantial shortcomings and a long series of potential biases may invalidate the observed associations. More analyses by multiple investigators, including contrarians, are necessary.”
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