Concentration Changes Of PM₁₀ Under Liquid Precipitation Conditions

Abstract

This study reports the results of field research into variability of the scavenging coefficient (Λ) of suspended dust comprising particles with aerodynamic diameters less than 10 mm. Registration of PM10 over 7 years in conditions of the occurrence of rainfall (convective light showers, large-scale precipitation and storms) was undertaken in an undeveloped rural area. The analysis involved 806 observations taken at constant time intervals of 0.5 hour. The measurements of the concentration of PM10 were performed by means of a reference method accompanied by concurrent registration of basic meteorological parameters. It was found that, for PM10, the scavenging efficiency is considerably influenced by rainfall intensity R and the type of precipitation. In the case of convective precipitation, data on Λ are only partially related to "classical approach" of rain scavenging. Within the range of comparable values of rainfall intensity, the type of wet deposition (except for storms) does not influence the effectiveness of scavenging PM10 from the ground-level zone. The large number of observations conducted in real-time conditions yielded a proposal of simple regression model, which can be deemed suitable for the description of variability Λ (DPM10), but only to a limited extent for large-scale precipitation. The collected results can be applied in air pollution dispersion models and deposition and were found to be generally representative for areas with similar climatic characteristics.

Model research on the influence of green roofs on environmental parameters in urban agglomerations

“…6. The results of measurements of particulate matter in the area of the green roof models confirmed the observations of other researchers [19], that the roughness of biologically active surfaces (especially after rainfall) intensifies the reduction of the concentration of particulate matter PM2.5 and PM10. Research will be continued to precisely determine the impact of various types of plants on the reduction of particulate matter contamination.…”

“…Analyses of particulate matter retention (PM2.5 and PM10) by plants and soil on the green roof were also performed, based on analyses conducted by various researchers [17][18][19]. Throughout the whole period of research, particulate matter was measured at the location of green roof models using a Holdpeak 5800D particulate matter meter.…”

Comparison of dry and wet deposition of particulate matter in near-surface waters during summer

“…In the case of wet deposition, rain scavenging generally takes place via Brownian diffusion, inertial impaction, diffusiophoresis, thermophoresis and electrical charge effects [ 54 – 56 ]. The process of rain scavenging is affected by many factors, including raindrop size distribution and intensity, particle size distribution and concentration, the chemical and physical properties of droplets and atmospheric temperature regimes [ 57 , 58 ].…”

Regions of pollution with particulate matter in Poland

“…Data provided by IOŚ-PIB [1] show that combustion of fuels for energy generation, mainly coal in stationary sources [2], accounts for approximately 75% of PM10 national emission and almost 100% of SO2 national emission. Aerosanitary situation is determined by pollution emission values as well as by weather conditions which, on the one hand, result in intensification of heating process and, on the other, may contribute to effective dispersion or accumulation of pollutants leading to smog situations [3][4][5][6][7][8][9].…”