The air is becoming increasingly polluted with harmful gases due to human actions.
Sulfur dioxide is made when fossil fuels that contain sulfur impurities are burned. It causes acid rain which: - Kills plants and aquatic life - Erodes stonework and corrodes ironwork.
Carbon monoxide is a poisonous gas formed from incomplete combustion in a car engine.
Oxides of nitrogen are formed in car engines. They cause photochemical smog and acid rain.
Nitrogen and oxygen from the air react in the hot car engine to make nitrogen monoxide and nitrogen dioxide.
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