About 99.82% of the global land area is exposed to levels of particulate matter 2.5 – tiny particles in the air that scientists have linked to lung cancer and heart disease – above the safety limit recommended by the Word Health Organisation, according to the peer-reviewed studyin Lancet Planetary Health. And only 0.001% of the world’s population breathes in air that is considered acceptable, the paper says.
While any amount of PM 2.5 is harmful, scientists and regulators are typically less concerned about daily levels than they are about chronic exposure. 6.7 million people a year, with nearly two-thirds of the premature deaths caused by fine particulate matter – quantifying the global exposure to PM2.5 was a challenge due to a lack of pollution monitoring stations.
When it came to estimating annual exposure across all regions, the researchers found that the highest concentrations occurred in eastern Asia , followed by southern Asia and northern Africa . Residents of Australia and New Zealand faced the least threat from fine particulate matter, while other regions in Oceania and southern America were also among the places with the lowest annual PM2.5 concentrations.
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