Env H 007 Criteria Air Pollutants, Part 1

Have you noticed some days there seems to be a "haze" in the air?  Does it seem harder to breathe on those days?  Ever wondered what exactly you inhale into your lungs with each breath?  This series on criteria air pollutants intends to provide these answers.  Here, the bios and roles played by each will be laid out in this macabre drama taking stage in your delicate skin, lungs, and other mucous membranes.