The peroxyacetil nitrate (PAN) is the most characteristic photoxidant, which is produced from NOx and reactive hydrocarbons in photochemical smog. In this paper daily PAN temporal evolution are compared with the Ox variable in different meteorological conditions. During the high-pressure period the Ox variable shows minimum values below the ozone background and maximum daytime values which can easily exceed this value (maximum Ox values range between 120-160 ppb). The presence of intense radical activity is confirmed by the variation of PAN concentrations (maximum PAN values range between 20-30 ppb). PAN is the only member of nitrogenous compounds produced by photochemical processes, which has very low natural background concentrations so it is the specific indicator of anthropogenic photochemical air pollution.
|Titolo:||Investigation on the behavior of pesticides in atmosphere|
AVINO, Pasquale (Corresponding)
|Data di pubblicazione:||2009|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|