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In page Air pollution:
"Exposure to air pollution varies by location, but also by age, by profession and by activity.[citation needed] For instance, somebody doing strenuous exercise will breathe in more pollution than somebody who is sitting typically.[1] For some pollutant, low exposure can be seen as safe, whereas other pollutants have negative health effects even at low levels.[2] Exposure to air pollution is worst in lower-middle income countries in line with the environmental Kuznets curve.[3]
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