Study on atmospheric particle pollution of Jinan in the spring of 2005
ZHOU Xuehua1,, WANG Zhe1, HAO Mingtu2, YANG Lingxiao1,WANG Wenxing1 1. Environment Research Institute of Shandong University, Jinan 250100 2. Shenzhen Environment Protection Monitoring Station, Shenzhen 518008
The concentration, temporal distribution and diurnal variation of PM10 and PM2.5 and the concentration of black carbon in fine particles were measured during the spring of 2005 in Jinan. The average concentrations of PM10 and PM2.5 were 242.5 μg·m-3 and 109.4 μg·m-3, respectively. According to China National Ambient Air Quality Standard Class II for PM10 of 150 μg·m-3 and EPA’s Standard for PM2.5 of 65 μg·m-3, Jinan air exceeded the standards for PM10 80.77% of the time and for PM2.5 84.61% of the time indicating very serious atmospheric pollution in the city. The average concentration of black carbon in PM2.5 was 5.39 μg·m-3 and the diurnal variation of black carbon shows two peaks. The mass fraction of PM2.5 in PM10 was 45.6% and the mass fraction of black carbon in PM2.5 was 5.06%. A further statistical analysis, together with meteorological parameters, indicated that the concentration of particles was positively correlated with the relative humidity (RH) and significantly negatively correlated with the wind velocity, but not obviously correlated with the temperature. Rain plays an important role in the cleanup of aerosols. The correlation coefficients of PM10, PM2.5 and BC with visibility were -0.633, -0.695 and -0.704, respectively, and the fine particles had a much more conspicuous effect on the decrease of visibility than coarse particles.