Study suggests fine particulate matter causes an additional 1.5 million premature deaths annually.
The World Health Organization’s most recent estimates (2016) are that over 4.2 million people die prematurely each year due to long-term exposure to fine particulate outdoor air pollution (often referred to as PM2.5,).
Light smog over a city – illustrative photo. Image credit: Pxhere, CC0 Public Domain
A recent study involving McGill researchers suggests that the annual global death toll from outdoor PM2.5 may be significantly higher than previously thought. That’s because the researchers found that mortality risk increased even at very low levels of outdoor PM2.5, which had not previously been recognized as potentially deadly. These microscopic toxins cause a range of cardiovascular and respiratory diseases and cancers.
“We found that outdoor PM2.5 may be responsible for as many as 1.5 million additional deaths around the globe each year because of effects at very low concentrations that were not previously appreciated,” said Scott Weichenthal, an Associate Professor in the Department of Epidemiology, Biostatistics, and Occupational Health at McGill University and the lead author on the recent paper in Science Advances.
Canadian data advances global understanding of the effects of outdoor pollution
The researchers arrived at this conclusion by combining health and mortality data for seven million Canadians gathered over a twenty-five-year period with information about the levels of outdoor PM2.5 concentrations across the country. Canada has low levels of outdoor PM2.5, making it the perfect place to study health impacts at low concentrations. Knowledge gained in Canada was then used to update the lower end of the scale to describe how mortality risk changes with outdoor PM2.5 levels. The result? An improved understanding of how air pollution impacts health on a global scale.
The WHO recently set out ambitious new guidelines for annual average outdoor fine particulate air pollution, cutting its earlier recommendations in half, from concentrations of 10 to 5 micrograms (ug) per cubic metre. The current United States Environmental Protection Agency standard of 12 (ug) per cubic metre is more than double the recommended value by the WHO.
“One take away is that the global health benefits of meeting the new WHO guideline are likely much larger than previously assumed,” adds Weichenthal. “The next steps are to stop focussing only on particle mass and start looking more closely at particle composition because some particles are likely more harmful than others. If we can better understand this, it may allow us to be much more efficient in designing regulatory interventions to improve population health.”
Source: McGill University