PAN in the Lower Troposphere

Multiple Choice

PAN in the lower troposphere

A) is principally related to sulfur dioxides.
B) is formed by particulates such as dust,dirt,soot,and ash.
C) damages and kills plant tissue but does not appear to affect people.
D) is emitted from the tail pipes of automobiles i.e. ,it comes directly from automobile exhaust.
E) is a form of particulate matter that is quickly washed from the atmosphere.