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surface water(77)
air quality(68)
emissions(65)
water quality(62)
carbon(49)
nitrogen(49)
particulate matter(41)
contaminants(32)
metals(32)
lakes(24)
lead(24)
humidity(23)
population(23)
particulates(22)
atmosphere(20)
heavy metals(20)
public health(20)
oxygen(19)
urban areas(19)
nitrogen oxides(17)
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