A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Theoretical Study of the Impact of Particulate Matter Gravitational Settling on Ambient Coarse Particulate Matter Monitoring for Agricultural Emissions
The particle size distributions (PSDs) of particulate matter (PM) in the downwind plume from simulated sources of a cotton gin were analyzed to determine the impact of PM settling on PM monitoring. The PSD of PM in a plume varies as a function of gravitational settling. Gravitational settling has a greater impact on the downwind PSD from sources with PSDs having larger mass median diameters (MMDs). The change in PSD is a function of the source PSD of emitted PM, wind speed, and downwind distance. Both MMD and geometric standard deviation (GSD) in the downwind plume decrease with an increase in down-wind distance and source MMD. The larger the source MMD, the greater the change in the downwind MMD and GSD. Also, the greater the distance from the source to the sampler, the greater the change in the downwind MMD and GSD. Variations of the PSD in the downwind plume significantly impact PM10 sampling errors associated with the U.S. Environmental Protection Agency (EPA) PM10 samplers. For the emission sources with MMD >10 µm, the PM10 oversampling rate increases with an increase in downwind distance caused by the decrease of GSD of the PSD in the downwind plume. Gravitational settling of particles does not help reduce the oversampling problems associated with the EPA PM10 sampler. Furthermore, over-sampling rates decrease with an increase of the wind speed.
Theoretical Study of the Impact of Particulate Matter Gravitational Settling on Ambient Coarse Particulate Matter Monitoring for Agricultural Emissions
The particle size distributions (PSDs) of particulate matter (PM) in the downwind plume from simulated sources of a cotton gin were analyzed to determine the impact of PM settling on PM monitoring. The PSD of PM in a plume varies as a function of gravitational settling. Gravitational settling has a greater impact on the downwind PSD from sources with PSDs having larger mass median diameters (MMDs). The change in PSD is a function of the source PSD of emitted PM, wind speed, and downwind distance. Both MMD and geometric standard deviation (GSD) in the downwind plume decrease with an increase in down-wind distance and source MMD. The larger the source MMD, the greater the change in the downwind MMD and GSD. Also, the greater the distance from the source to the sampler, the greater the change in the downwind MMD and GSD. Variations of the PSD in the downwind plume significantly impact PM10 sampling errors associated with the U.S. Environmental Protection Agency (EPA) PM10 samplers. For the emission sources with MMD >10 µm, the PM10 oversampling rate increases with an increase in downwind distance caused by the decrease of GSD of the PSD in the downwind plume. Gravitational settling of particles does not help reduce the oversampling problems associated with the EPA PM10 sampler. Furthermore, over-sampling rates decrease with an increase of the wind speed.
Theoretical Study of the Impact of Particulate Matter Gravitational Settling on Ambient Coarse Particulate Matter Monitoring for Agricultural Emissions
Wang, Lingjuan (author) / Parnell, Calvin B.Jr. (author) / Buser, Michael D. (author)
Journal of the Air & Waste Management Association ; 57 ; 111-115
2007-01-01
5 pages
Article (Journal)
Electronic Resource
Unknown
| Taylor & Francis Verlag | 2006
| British Library Conference Proceedings | 2006
Nonlinear Analysis and Prediction of Coarse Particulate Matter Concentration in Ambient Air
| Taylor & Francis Verlag | 2006
The Impact of Diesel Particulate Emissions on Ambient Particulate Loadings
| British Library Conference Proceedings | 1994
Ambient fine and coarse particulate matter pollution and respiratory morbidity in Dongguan, China
| Online Contents | 2017