Carbon Monoxide: Clear and odorless car emitted from car exhausts. Can kill humans and animals in a concentrated dose by cutting off oxygen to the brain.
Carbon Dioxide: Emitted from burning of fossil fuels. Needed to keep us in a habitable climate, but too much causes global warming.
Sulfur Dioxide: Forms from bustion of coal and oil in factories. Turns in to sulfuric acid and damages plant life.
Nitrogen Dioxide: NO reacts with O2 to form this gas. When combined with wator vapor it can form nitric acid, which is toxic for water life.
Ozone: Bad ozone is formed in the troposphere. It is a large part of photochemical smog and causes breathing problems. Created by car exhaust among other things.
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