What is the full form of PAN?

Peroxyacetyl nitrate

The correct answer is option 1. Peroxyacetyl nitrate.

Peroxyacetyl nitrate is PAN's full name. It is an unstable secondary contaminant found in photochemical smog. In comparison to ozone, they dissolve more readily in water. It has a boiling point of 105°C and the chemical formula C₂H₃NO₅. PAN is created when non-methane volatile organic molecules are oxidized.