Peroxyacetyl Nitrates (PANs)in the Lower Troposphere

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 and is an irritant to people.
D) are emitted from the tail pipes of automobiles;i.e. ,it comes directly from automobile exhaust.
E) may damage plants,forests,and crops,but have no adverse effects on humans.