Naslov
Photochemical pollution indicators from ozone data

Autori
Klasinc, Leo ; Cvitaš, Tomislav ; Matasović Brunislav ; McGlynn Sean P.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts 43rd World Chemistry Congress IUPAC 2011 / - , 2011

Skup
43rd World Chemistry Congress IUPAC 2011

Mjesto i datum
San Juan (CA), Sjedinjene Američke Države; Portoriko, 30.07.2011. - 05.08.2011

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ozone; air pollution; photochemical pollution indicators

Sažetak
Ozone is a natural constituent of Earth's atmosphere with more than 90 % of it occuring in the stratosphere. Some of it penetrates into the tropsphere and gets destroyed close to Earth's surface. On the other hand, it also is formed in the boundary layer owing to increased emissions of nitrogen oxides and hydrocarbons. Here it causes harmful effects to humans, vegetation and many materials giving rise to what is commonly called photochemical pollution. As its main component ozone is regularly monitored and recorded as one of the indicators of air quality. Air quality standards are based on peak half-hourly, hourly or 8-hourly average values, but since its formation is triggered photochemically the diurnal variation of ozone volume fraction shows a maximum at noon and early afternoon and minima in the morning and evening rush hours when it gets destroyed in numerous reactions with primary pollutants. The products of these reactions are often equally potent pollutants as ozone itself and a better indicator of air quality at a location is then in addition to the effect of peak values also based on the average ratio of daily maximum-to-minimum ozone fraction. The definition of corresponding indicators that take into account corrections for the amount of daily ozone production and the number of hours the hourly average exceeded some limit value over a given period (usually the vegetation growth season) will be described. The application to long term ozone data over central Europe, Mediterranean region and in the subtropics will be shown.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA