Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Windblown Dust Contributes to High PM25 Concentrations
The revised National Ambient Air Quality Standards for PM include fine particulate standards based upon mass measurements of PM25. It is possible in arid and semi-arid regions to observe significant coarse mode intrusion in the PM2.5 measurement. In this work, continuous PM10, PM2.5, and PM1.0 were measured during several windblown dust events in Spokane, WA. PM2 5 constituted ~30% of the PM10 during the dust event days, compared with ~48% on the non-dusty days preceding the dust events. Both PM10 and PM2.5 were enhanced during the dust events. However, PM1.0 was not enhanced during dust storms that originated within the state of Washington. During a dust storm that originated in Asia and impacted Spokane, PM1.0 was also enhanced, although the Asian dust reached Washington during a period of stagnation and poor dispersion, so that local sources were also contributing to high particulate levels. The “intermodal” region of PM, defined as particles ranging in aerodynamic size from 1.0 to 2.5 um, was found to represent a significant fraction of PM25 (~51%) during windblown dust events, compared with 28% during the non-dusty days before the dust events.
Windblown Dust Contributes to High PM25 Concentrations
The revised National Ambient Air Quality Standards for PM include fine particulate standards based upon mass measurements of PM25. It is possible in arid and semi-arid regions to observe significant coarse mode intrusion in the PM2.5 measurement. In this work, continuous PM10, PM2.5, and PM1.0 were measured during several windblown dust events in Spokane, WA. PM2 5 constituted ~30% of the PM10 during the dust event days, compared with ~48% on the non-dusty days preceding the dust events. Both PM10 and PM2.5 were enhanced during the dust events. However, PM1.0 was not enhanced during dust storms that originated within the state of Washington. During a dust storm that originated in Asia and impacted Spokane, PM1.0 was also enhanced, although the Asian dust reached Washington during a period of stagnation and poor dispersion, so that local sources were also contributing to high particulate levels. The “intermodal” region of PM, defined as particles ranging in aerodynamic size from 1.0 to 2.5 um, was found to represent a significant fraction of PM25 (~51%) during windblown dust events, compared with 28% during the non-dusty days before the dust events.
Windblown Dust Contributes to High PM25 Concentrations
Claiborn, Candis S. (Autor:in) / Finn, Dennis (Autor:in) / Larson, Timothy V. (Autor:in) / Koenig, Jane Q. (Autor:in)
Journal of the Air & Waste Management Association ; 50 ; 1440-1445
01.08.2000
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Windblown Dust Contributes to High PM~2~.~5 Concentrations
| British Library Conference Proceedings | 2000
Approaches for Controlling Windblown Dust Emissions in Southern California Desert Areas
| British Library Conference Proceedings | 1994
Approaches for Controlling Windblown Dust Emissions in Southern California Desert Areas
| British Library Conference Proceedings | 1994
Instruments and Techniques for Measuring Windblown Dust and PM10 at Owens Lake, California
| British Library Conference Proceedings | 1994