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any addition of harmful substances or products in the environment (air, water, soil or food). For questions specifically about [air-polution], [greenhouse-gas-emissions] or [toxic-chemicals] please use those tags.

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Plant a lot of trees -- assuming you mean partciulate pollution: See for example Estimating the removal of atmospheric particulate pollution by the urban tree canopy of London, under current and future environments, Tallis et al. 2011 …
answered Feb 4 '16 by Chris H