A new satellite-derived dataset links concentrations of fine particulate matter in air pollution with health outcomes in cities around the world.
Air pollution is the fourth leading risk factor for death around the world. But one type of pollutant is particularly harmful: fine particulate matter (PM2.5). These small, inhalable particles (less than 2.5 micrometers in diameter) result from direct emissions into the air, as well as interactions among other pollutants. PM2.5 is the leading cause of death among air pollutants, contributing to cardiovascular and respiratory disease and millions of premature deaths worldwide each year.
In a new study covering urban settlements worldwide, researchers found that PM2.5 concentrations and associated mortality declined in some areas due to reductions in precursor pollutants (such as oxides of sulfur and nitrogen) after the passage of clean air laws. However, the global average mortality rate attributable to PM2.5 remained relatively stable from 2000 to 2019.
“That’s the global average,” said Susan C. Anenberg, an associate professor of global health at the George Washington University, “and that really masks very different dynamics happening depending on where you are in the world.”
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Image via NASA Earth Observatory
