Front

Non-point source

Back

Release of pollutants from numerous, widely dispersed origins.

Front

Point source

Back

Release of pollutants from a single, clearly identifiable site.

Front

Persistent pollutants

Back

Pollutants that don't break down under natural processes.

Front

Biodegradable pollutants

Back

Pollutants that can break down under natural processes.

Front

Primary pollutants

Back

Active upon emission, such as carbon dioxide and nitrate containing substances.

Front

Secondary pollutants

Back

Arise from primary pollutants undergoing some kind of physical or chemical change.

Front

Acute pollution

Back

Occurs during a pollution incident.

Front

Chronic pollution

Back

When pollution is persistent and perhaps recurrent.