Central Technological Library of the University of Ljubljana (CTK)
13.
Measurements of particulate matter ▫$PM_10$▫ in air under low air temperature conditions
Čuhalev, Igor ; Kocuvan, Roman
The paper deals with the issue of high ▫$PM_10$▫ concentrations under low-temperature states in areas affected by thermal power plants as well as inurban environments. Under winter conditions, there ...are considerably increased ▫$PM_10$▫ concentrations in air registered at the time of minimal concentrations of primary polutants (▫$SO_2$▫ and ▫$NO_x$▫). ▫$PM_10$▫ concentrations are on the level of 80 ▫$\mugm^-3$▫ and more. This phenomenon has been noted on a rather vast area of Slovenia within the radius of 50 X 50 km. The characteristic pattern of the ▫$PM_10$▫ concentrations at the time of low air emperatures is atributed to processes of secondary organic aerosols (SOA). This process is also connected with the temperature inversion phenomenon. Characteristic for a typical time pattern of its episodes is an increase in the ▫$PM_10$▫ concentrations, and partly also in the ▫$NO_x$▫ concentrations, followed by a distinct photochemical process with increased ozone and at the same time also ▫$SO_2$▫ concentrations from higher atmospheric layers. For the established organised air monitoring it is recommended to recognise conditions giving rise to SOA and to adequately notify the public about the phenomenon of high ▫$PM_10$▫ concentrations and later also the rest of photochemical oxidants.
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