Mass concentration, visibility of PM10, PM2.5, PM1, and water-soluble ion concentration of PM2.5 and other parameters have been continuous observed, from February 9 to February 16, in 2013, in Nanjing City. Discussed the reason for the reduction of visibility and decline of air quality while a short term peak appears during the Spring Festival with fireworks. The study found that, due to the discharge of Fireworks, the concentration of PM2.5 reached 863μg/m3 in some area in a short period of time, and the visibility is only 1.2km. At the same time, PM2.5 in Cl-, K＋ and SO2-4 rose dramatically in a short time, which to some degree is relating to the release of oxidants, reducing agents and other components in fireworks. Observations during the Spring Festival Statistics found that the contribution of the fireworks discharge to water-soluble ions in PM2.5 is about 50%.
principal component analysis