![]() Sometimes in hot summer months, however, Ozone will be the main pollutant. For this reason, PM2.5 is most often the “main pollutant” in the air, dictating overall AQI. It's near microscopic size means that it is so small it can be absorbed into the bloodstream upon inhalation - causing a variety of effects on a number of organs. PM2.5 is generally the most prevalent pollutant present at harmful levels.
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