The air in our lungs
Last updated 12/13/2019 at 4:34pm
The air around us is polluted, and the level of pollution in our air varies constantly. The causes of the pollution fluctuate as well. The pollution consists of gases and particulate matter. Common “natural” sources are forest and range fires, volcanic activity and various gases that originate in nature. Most all of these natural sources are not constant, unlike the sources that humanity pr...