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PM2.5 are very small particles, about less than 2.5 microns, less than one-tenth of the thickness of your hair. It is difficult to filter and is linked to increased chance in lung cancer.
The common sources for PM2.5 particles are cigarette smoke, wood smoke, vehicle exhausts, and salt sprays from the ocean. This visualisation only shows human-made emissions, which accounts for about 10 percent of all PM2.5 particles.
PM2.5 particles has significant health impacts on people who have asthma, and introduced increase risk of premature mortality.