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Troposphere - This level of the atmosphere ranges from 0 km to 10 km above sea level.

Stratosphere - This level of the atmosphere ranges from 10 km to 50 km above sea level. 

Ozone Depleting Substance - ODS

The Greenhouse Effect - This is a natural and necessary phenomenon maintaining a suitable temperature for life on Earth.

Montreal Protocol - This is an international agreement made by the UN made to phase out the production of ODS in 1987.

Thermal Stratification - This is the vertical temperature layering that happens within our atmosphere.

Primary Pollutants - These pollutants are emitted directly from a process and may be natural.

Secondary Pollutants - A pollutant that forms in the atmosphere by chemical reaction with primary pollutants, natural components of the air, or both.

Particulates - These are the tiny pieces of carbon and other substances caused by burning any organic substances or fossil fuels. 

Photochemical Smog - This is mainly nitrogen dioxide and ozone, but is a complex mixture of 100 different primary and secondary pollutants - created due to this mixture and action from the sun.