US Air Pollution Caused by Canada Wildfires More Harmful Than Indoor Second-Hand Smoking Medicine & Technology Jul 25, 2023 The World Health Organization (WHO) recommends that humans only inhale 15 micrograms per cubic meter of PM2.5, but on June 7 from 3:00 p.m. to 7:00 p.m., they recorded 330 micrograms per cubic meter. Read to learn more.
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