Definitions for "Air Quality"
The composition of air with respect to quantities of pollution therein; used most frequently in connection with "standards" of maximum acceptable pollutant concentrations. Used instead of "air pollution" when referring to programs.
A measure of the quantity of pollutants in the air.
The level of atmospheric pollution present during a specific time in a specific geographical area. A regulating body, office or agency (EPA) sets standards.
The measure of purity of invisible, odourless, and tasteless gases that surround the earth.
(in context of the national parks:) the properties and degree of purity of air to which people and natural and heritage resources are exposed.
Keywords:  breathe, condition
The condition of the air we breathe.