Present Situation and Prospect of Atmospheric Environmental Quality in Tibet Autonomous Region

This paper analyzed the pollution characteristics and current situation of pollutants by collecting realtime monitoring data of SO₂,NO₂,CO,O₃,PM₁₀,PM_2.5 in seven cities of Tibet Autonomous Region from 2015 to 2021.The results showed that the annual average concentrations of PM_2.5,PM₁₀,SO₂,NO₂ and CO were relatively stable,and the concentrations of O₃ and NO_X showed an upward trend.The average concentration of O₃-8h increased from 105 μg/m³ in 2015 to 124 μg/m³ in 2021.O₃ concentration over the standard mainly occurred from May to August.The monthly average concentration of PM_2.5 showed significant seasonal difference.The content of PM_2.5 was low in summer （July-September） and high from November to March of the next year.The comprehensive air pollution index was less than 5,and the ratio of excellent days was 98.5%～99.7%.In the statistical years,the annual average concentration of O₃ and PM_2.5 in 2015 and 2016 reached the standard II,and the annual average concentration of the other four evaluation indicators reached the standard I,and the ambient air quality in the whole region remained good.The ratio of NO₂/SO₂ in Lhasa City and Changdu City was larger than the ratio in Naqu City and Ali City.The research results would provide reference for air pollution control in Tibet Autonomous Region.