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以北小河公园为研究对象,通过PM2.5浓度监测仪测定公园绿地内、公园附近建筑室内及公园道路旁(开敞空间)的PM2.5浓度,对公园、室内与道路旁PM2.5浓度做差异对比分析,评价城市公园对降低大气PM2.5浓度的作用,同时探讨环境要素对PM2.5浓度的影响。结果表明:(1)公园、室内与道路旁PM2.5浓度日变化趋势基本一致,呈现双峰单谷型,即早晚高,白天低。(2)无污染或轻度污染时,公园绿地均低于道路旁及建筑室内,浓度分别降低了4.9%和8.4%,说明公园绿地对PM2.5有一定的滞留作用;中度污染天气条件下,公园内PM2.5浓度同样低于道路旁与室内,降幅分别为11.7%和19.4%,公园绿地对PM2.5滞留作用比较明显。重度污染天气条件下,公园内PM2.5浓度略低于道路旁,高于建筑室内,说明公园绿地对PM2.5滞留作用的发挥是受一定的天气污染条件的制约。(3)公园绿地PM2.5浓度与温度、风速成负相关关系,与相对湿度、气压成正相关关系;道路旁PM2.5浓度与车流量成正相关。
The PM2.5 concentration in parkland, indoor and park roadside (open space) in park green space, park, indoor and roadside was measured by PM2.5 concentration monitor in North Creek Park, Make comparative analysis of differences, evaluate the role of urban parks in reducing PM2.5 concentration in the atmosphere, and explore the impact of environmental factors on PM2.5 concentration. The results showed that: (1) The diurnal variation trend of PM2.5 concentration in parks, indoor and roadsides was basically the same, presenting a bimodal single-valley pattern, that is, morning and evening high and low daytime. (2) In the non-polluting or slight pollution, the green space of the park is lower than that of the roadside and the interior of the building, and the concentrations of the parkland are reduced by 4.9% and 8.4% respectively, indicating that the park greenland has a certain detention effect on PM2.5; under moderately polluted weather conditions . The PM2.5 concentration in the park is also lower than that of the roadside and the indoor area, with a decrease of 11.7% and 19.4% respectively. The park green space has a more obvious effect on PM2.5 retention. Severe polluted weather conditions, the PM2.5 concentration in the park is slightly lower than the road, higher than the interior of the building, indicating that park green PM2.5 retention effect is subject to certain conditions of weather pollution constraints. (3) PM2.5 concentration in park green space is negatively correlated with temperature and wind speed, and positively correlated with relative humidity and air pressure; PM2.5 concentration in roadside park is positively related to vehicle flow.