Abstract: With the pollutants monitoring data and meteorological data during the Spring Festival in Tianjin City in 2016 and 2017, the variation characteristics of atmospheric pollutant concentration and the influence of fireworks on atmospheric pollution were investigated. The results indicated that the peak concentration of atmospheric particulate matter during the Spring Festival appeared from 00:00 to 01:00 on the first day of New Year. Fireworks had a greater impact on the concentration of particulate matter and SO₂ than the other pollutants, especially for the ground concentration. The influence on particulate concentration was relatively high. The concentrations of PM₁₀, PM_2.5, SO₂ and NO₂ increased by 305, 178, 80 and 7 μg/m³ from 00:00 to 01:00. The daily variations of PM_2.5 and PM₁₀ concentrations were greater during the Spring Festival than during non-festival because of fireworks. The peak concentration of pollutants in the main peak period (20:00 to 01:00 of next day) was increased and delayed. The main peak period of SO₂ changed from morning (09:00-10:00) to about 00:00, and the peak concentration increased dramatically. The discharge of fireworks resulted in an increase in the concentration of fine particles in the air. The proportion of PM_2.5 in PM₁₀ increased significantly, and the main influencing period was at night. The maximum hourly concentration and its change rate of PM_2.5, PM₁₀ and SO₂ during the Spring Festival were higher than that before and after the Spring Festival, while the maximum hourly concentration and the variability of NO₂ and CO concentrations were lower than that before and after the Spring Festival. The half-lives of PM_2.5 on Chinese New Year's Eve in 2016 and 2017 were 4.7 and 3.6 h. The results show that fireworks and firecrackers can make the concentrations of PM₁₀, PM_2.5 and SO₂ increase rapidly for a short time even in the meteorological conditions conducive to diffusion. The main peak value of mass concentration appeared at night, and the half-life of PM_2.5 concentration is between 3 and 5 h.