What are PANs air pollution?
Peroxyacyl nitrates or PANs, which are also referred to as acyl peroxy nitrates or APN, are a component of photochemical smog, produced in the atmosphere when oxidized volatile organic compounds combine with nitrogen dioxide (). …
What is Pan in ecology?
Peroxyacyl nitrates are a family of compounds which result from photochemical reactions between contaminants released to the atmosphere by combustion of organic fuels. Peroxyacetyl nitrate (PAN) is the most abundant member of this family and is responsible for serious plant injury in some polluted areas.
Is Peroxyacetyl nitrate natural?
A unique property of PANs is that they are not directly emitted from any known source. They are all products of atmospheric photochemical reactions involving hydrocarbons and nitrogen oxides (NOx=NO+NO2).
Why photochemical smog is called so?
Ground-level ozone constitutes one of the major components of photochemical smog, so called because of the photochemical reaction of air pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) with ultraviolet light (sunlight); thus, the O3 levels vary strongly with season and the highest levels …
How is Peroxyacetyl nitrate created?
Peroxyacetyl nitrate (CH3C(O)O2NO2, PAN) is formed alongside ozone (O3) from photochemical reactions of volatile organic compounds (VOCs) and nitrogen oxides (NOx = NO+NO2) (Aikin et al., 1982; Lonneman et al., 1976), and has long been regarded as a photochemical pollution indicator (Penkett and Brice, 1986; Stephens.
How is Peroxyacetyl nitrate made?
2.1. Similar to O3, peroxyacetyl nitrate (PAN) is formed from the oxidation of volatile organic compounds (VOCs) in the presence of NOx. PAN is thermolabile and can decompose into NO2 quickly under warm conditions.
How is Peroxyacetyl nitrate formed?
Where is Peroxyacetyl nitrate from?
I may be in the air you breathe. Peroxyacetyl nitrate is an unstable, highly oxygenated compound that exists only in the atmosphere. It is a key intermediate in the formation of the air pollutant ozone.
What is the difference between smog and photochemical smog?
The term smog can be described as fog or haze intensified by smoke or other atmospheric pollutants. The key difference between classical smog and photochemical smog is that classical smog forms due to humid climate, whereas photochemical smog forms due to smoke coming from automobiles and factories.