Peroxyacetyl Nitrates (PANs) in the Lower Troposphere

Multiple Choice

Peroxyacetyl nitrates (PANs) in the lower troposphere

A) are principally related to sulfur dioxides.
B) are formed by particulates such as dust, dirt, soot, and ash.
C) damages and kills plant tissue but does not appear to affect people.
D) are emitted from the tail pipes of automobiles; i.e., it comes directly from automobile exhaust.