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rural areas(5)
population(4)
surface water(4)
carbon(3)
nitrogen(3)
public health(3)
sulfur(3)
urban areas(3)
biomass(2)
emissions(2)
geochemistry(2)
lakes(2)
particulates(2)
ph(2)
sediments(2)
wetlands(2)
absorption(1)
agriculture(1)
air quality(1)
ammonia(1)
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