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HEPA filters (high-efficiency particulate air) filters are filters that are capable of absorbing up to 99.97% of all particulate matter down to 0.3-micron in size almost all of the time

(There were too few transgender respondents in this sample for the researchers to include gender identity in their analysis.) The researchers adjusted for other variables including sex, age, race/ethnicity, education level (for participants over 18) and parents education level (for participants under 18), and where participants lived (urban/nonurban, and region of the US)

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They pollute not only the soil, but also waterways and oceans, at a rate of 500 liters of water for a single cigarette butt