What are harmful substances that are in the air, water, or soil called?

What are the sources of pollution?

Most air pollution from human activities comes from______________

hydrocarbons are:

Do all fuels burn completely?

Burning fossil fuels causes all of the following except

What is similar between London-type smog and acid rain

When does photochemical smog form?

Which is not a step in the formation of acid rain?

What government agency monitors air quality?

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