【摘要】 城市环境大气颗粒物污染对城市环境和居民健康产生了一定危害和影响,而PM_2.5、PM₁₀超标是导致污染的重要因素,因此从源头上控制城市扬尘污染对提升城市环境大气质量具有重要意义。该研究以河北秦皇岛市为研究城市,分析了城市扬尘的PM₁₀、PM_2.5、降尘量和降尘粒径分布等特征。研究表明:研究区的土壤扬尘污染季节变化特征明显,荒地、河滩和耕地的PM₁₀、PM_2.5浓度在春季最高,其次为秋季和冬季,夏季最低。受土地类型影响排放强度大小为:荒地>河滩>耕地,其降尘量分别为5.05、1.96和1.36 t/（km²·30 d）,土壤扬尘降尘粒径在0～1μm没有分布,集中分布在10～50μm;对荒地进行植被覆盖试验可知,最佳播种量为18 g/m²,植被3个月左右可完成建植,对土壤扬尘的有效控制率可达到79%。更多还原

【Abstract】 Urban environmental atmospheric particulate pollution has certain harm and impact on urban environment and residents’health,and PM_2.5and PM₁₀exceeding the standard are important factors leading to pollution.Therefore,controlling urban dust pollution from the source is of great significance to improve urban environmental air quality.This study takes Qinhuangdao City,Hebei Province as the research city,and to analyze the PM₁₀,PM_2.5,dustfall and dust particle size distribution characteristics of urban dust.The studies showed that the seasonal variation of soil dust pollution in the study area was obvious,and the concentrations of PM₁₀and PM_2.5in wasteland,river beach and cultivated land were the highest in spring,followed by autumn and winter,and the lowest in summer.The emission intensity affected by land type was wasteland>river beach>cultivated land,and the dustfall were 5.05,1.96 and 1.36 t/（km²·（30 d））,respectively.Particle size of soil dust precipitation was not distributed in 0～1μm,and was concentrated in 10～50μm.The vegetation coverage test on the wasteland shows that the optimal seeding amount was 18 g/m².Vegetation can be built in 3 months,and the effective control rate of soil dust emission can reach 79%.更多还原