United States Environmental Protection Agency "AIRNow" Air Pollution and Human Health
Ground-level ozone and airborne particles are the two pollutants that pose the greatest threat to human health in this country. ... Particle pollution, also known as particulate matter, is composed of microscopic solids or liquid droplets that are so small that they can get deep into the lungs and cause serious health problems. ... Ozone, also known as smog, can irritate your respiratory system, causing coughing, irritation in your throat or a burning sensation in your airways. It can reduce lung function, so that you may have feelings of chest tightness, wheezing, or shortness of breath.
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