Consequences
emission - the act of sending out gas
endanger human, plants, animals health - to put someone or something at risk or in danger of being harmed, damaged, or destroyed.
reduce visibility
produce undesirable odors
photochemical smog
produce adverse effect in areas far from the site of the original emission (a negative or harmful result on something)
acid precipitations (snow, hail, fog, mist) affect animals, plants, lakes and rivers.