青羊湖国家森林公园大气PM1.0、PM2.5及PM10.0浓度变化

Concentration changes of PM1.0,PM2.5 and PM10.0 in air in the Qingyang Lake National Forest Park

以青羊湖国家森林公园为研究对象,开展森林植被区大气颗粒物的动态监测,揭示空气PM浓度日变化特征及其与气象因子的关系。结果表明:森林植被区域大气颗粒物浓度较低,其中PM10.0浓度日均值为60.37μg/m^3,低于二类大气环境浓度限值;PM2.5浓度日均值为22.79μg/m^3,低于一类大气环境浓度限值;而PM1.0浓度位于2.96~12.61μg/m^3,日均值为7.65μg/m^3。PM1.0、PM2.5及PM10.0浓度日变化显著,以清晨(6∶00-8∶00)最高,上午(10∶00-12∶00)和下午(16∶00-18∶00)较低。随着气温的升高,大气PM1.0、PM2.5、PM10.0浓度逐渐降低;而随着相对湿度的增加,大气PM1.0、PM2.5、PM10.0浓度逐渐增加,呈显著二项式回归关系,回归系数均超过0.6。因此,从大气颗粒物考虑,建议市民在夏季下午或傍晚前往森林公园,且应多选择空气湿度较低的区域开展休闲游憩活动。

Taking the Qingyang Lake National Forest Park as an object,daily changes of air PM concentration and relationships between the PM and meteorological(temperature,relative humidity)factors were discussed through dynamic monitoring on the particulates in vegetation areas.Results showed that concentration of air particulates were low in the vegetation areas.Daily concentration of PM 10.0 was 60.37μg/m 3,below the limit value of the second atmospheric environments.Daily concentration of PM 2.5 was 22.79μg/m 3,below the limit value of the first atmospheric environments.Daily concentration of PM 1.0 was in the range from 2.96μg/m 3 to 12.61μg/m 3,and the mean was 7.65μg/m 3.Concentration of PM1.0,PM2.5 and PM10.0 changed significantly in a day,with the highest concentration in the early morning(6∶00-8∶00),and lower in the morning(10∶00-12∶00)and afternoon(16∶00-18∶00).The concentration of PM1.0,PM2.5 and PM10.0 decreased with the increasing air temperature and increased with the increasing air relative humidity.Relationship between PM concentration and temperature and relativehumidity were in binomial express and regression coefficient was above 0.6.Considering the air particulates,the best time for going to National Forest Park is afternoon and dusk,and ideal regions for leisure and recreation are the areas with low air relative humidity.