Abstract:In order to understand the impact of fireworks burning on the concentration of gaseous pollutants and water-soluble inorganic ions, organic carbon (OC) and elemental carbon (EC) in PM2.5 in Baoding, the concentration characteristics of atmospheric pollutants and particulate components were analyzed and the contribution of fireworks was evaluated during the Spring Festival. The results showed that the average concentration of PM2.5, PM10, SO2, NO2,and CO during the centralized discharge of fireworks in 2019 increased by 1.3, 1.0, 1.1, 0.4, and 0.02 times, respectively, compared with the non-centralized fire period. After the implementation of the burning ban during the Spring Festival in Baoding City, the average concentration, maximum concentration and duration of high concentration of pollutants on New Year's Eve and the first day all decreased significantly. During the centralized discharge period of fireworks, the contribution of fireworks to the concentration of PM2.5, PM10 and SO2 decreased from about 50% (2018 and 2017) to about 30% (2019), of which SO2 contribution decreased more evidently than that of PM2.5 and PM10. In addition, the component analysis showed that the proportion of total K+, Mg2+, and Cl- concentrations in water-soluble ions accounted for 39.3% and 51.1% respectively, at the reception center site (main urban area) and Zhuozhou site (district-county built-up area) during fire period, the fractions of which were significantly higher than those in non-fire period. The contribution of fireworks to the concentration of K+, Mg2+, and Cl-in PM2.5 was more than 50%, of which the contribution to K+ was as high as 89.0%. The contribution of SO42-, K+, Mg2+, and Cl-at the Zhuozhou site was 2.2, 2.1, 1.9, and 1.8 times that of the reception center site, respectively. The sulfur oxidation rate (SOR), nitrogen oxidation rate (NOR), OC, and EC concentrations in the discharge period increased to a certain extent compared with the non-discharge period, in which OC and EC increased by 2.5 and 2.1 times, respectively, showing fireworks and firecrackers affect OC more than EC.
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