How is Ambient Air Quality defined?

Ambient Air Quality refers specifically to the levels of pollutants in the outdoor atmosphere that people are exposed to in their daily environments. This is primarily measured at ground level, where air quality can directly impact human health and the environment. The focus is on tracking various pollutants such as particulate matter, ozone, carbon monoxide, and sulfur dioxide, among others, to assess the overall air quality in a specific area.

The emphasis on outdoor measurements is crucial since pollutants often fluctuate based on time of day, weather conditions, and local activities. Therefore, option C accurately captures the essence of Ambient Air Quality by specifying that it is concerned with pollution levels measured at ground level outdoors, where the majority of human exposure occurs.