Continuous monitoring of atmospheric conventional pollutants in the airport area was carried out at the point adjacent to the runway of Tianjin airport. The Generalized Additive Model (GAM) was applied to identify the impact factors of NO₂ and O₃ between March 2017 and February 2018, and the contribution rate was determined. The selected factors included environmental factors (SO₂, NO, NO₂ and O₃, CO, PM_2.5, PM₁₀ and previous concentration), meteorological factors (wind direction, wind speed, temperature, dew point temperature, correction of sea pressure) and aviation activity factors (takeoff and landing). The results showed that the daily mean of NO₂ was 17.6~123.6 μg/m³. Among them, the number of days exceeding the standard was 38, accounting for about 13%. The daily mean of O₃ was 1.0~276.1 μg/m³, accounting for 26% of the days exceeding the standard. The pollution of O₃ in the airport area was mainly concentrated in summer. Environmental factors, whose contribution ratewas between 56% and 89%, were the main factors affecting the atmospheric environment in the area. As an important regional pollution source, the contribution rate of aviation activities to the change of atmospheric NO₂ and O₃ concentration was more prominent, Which accounts for 20%. The relative contribution of meteorological factors was relatively low. All Adj-R² of GAM were from 0.85 to 0.96, and the screened influence factors could effectively explain the variation of conventional gaseous pollutants.