Pollutants that form from a reaction between chemicals in the air are _____.

A(n) _____ is a sour-tasting substance that reacts with metals for form hydrogen.

The _____ scale is used to determine whether something is an acid or base.

A harmful chemical that enters the air directly is called a(n) _____.

Excess carbon dioxide can be stored by _____.

A(n) _____ is a device designed to reduce vehicle emissions.

Liquid or solid particles in the air are known as _____.

A _____ is a device used to remove sulfur from industrial smokestack emissions.

A(n) _____ is a bitter, slippery substance that contains hydroxyl radical.

Substances released into the air are know as _____.

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