One Common Health Consequence of Pollutants Such as Particulate Matter

One common health consequence of pollutants such as particulate matter, sulfur dioxide, nitrous oxides, and ozone is:

A) They are responsible for global warming related illness.
B) They irritate the eyes and skin.
C) They irritate the respiratory tract and aggravate respiratory illness such as asthma.
D) They reduce the blood's ability to transport oxygen.