Characteristics of Main Atmospheric Pollutants in Heating Season of Beijing

The 1-hour average mass concentration of CO, NO ₂, SO ₂, O ₃, PM _2.5 and PM ₁₀ from November 2013 to the first half of April 2014 obtained from 35 air automatic monitoring sites in Beijing was used to analyze temporal and spatial distribution of atmospheric pollutants. The results show that the average concentration for CO, NO ₂, SO ₂, O ₃, PM _2.5 and PM ₁₀ in heating season was 2.62mg/m ³, 64.05μg/m ³, 50.52μg/m ³, 26.39μg/m ³, 118.61μg/m ³ and 126.05μg/m ³ respectively. The concentration of NO ₂ changes slightly, and the highest concentrations of SO ₂ and particulate matter are in February, CO shows a steady downward trend, while O ₃ is gradually increased.NO ₂,PM _2.5 and PM ₁₀ concentration diurnal variation show a bimodal. With fine particulate pollution levels increased the proportion of PM _2.5 in PM ₁₀ and the concentrations of NO ₂, CO, SO ₂ gradually rises, the O ₃ change trend is opposite. The concentration of O ₃ is the highest in comparative and regional stations respectively, while that of other pollutants is the highest in traffic pollution monitoring stations. The distribution of atmospheric pollutants mass concentration in heating season in Beijing is derived by the Original Kriging interpolation method, and it shows from the figure that the concentrations of PM ₁₀,PM _2.5,CO,NO ₂,SO ₂ gradually increases from the northern mountain area to the southern part of Beijing. O ₃ concentration in the urban area is significantly inferior to other regions.