春节期间，四川局部预计有重度污染风险

Core Viewpoint - The air quality in the Sichuan Basin is expected to be generally good in the latter half of February, with some fluctuations due to fireworks and cold air activities [1] Summary by Relevant Sections Air Quality Forecast - The Sichuan Provincial Ecological Environment Monitoring Station predicts that the air quality will primarily be good to lightly polluted in early to mid-February, with deterioration expected due to fireworks during the festival [1] - From February 19 to 20, the impact of fireworks will weaken, leading to a slight improvement in air quality, although conditions will remain generally average [1] - Strong cold air is anticipated from February 21 to 22, which is expected to improve air quality to excellent levels [1] Specific Dates and Conditions - During the Spring Festival (February 16-18), the overall air quality will be good, but there is a risk of moderate to severe pollution in some cities due to fireworks [1] - From February 23 to 24, stagnant conditions may lead to a slow accumulation of pollutants, posing a risk of light pollution in certain areas [1] Uncertainties and Future Monitoring - There is significant uncertainty regarding future cold air activities and precipitation, which may require ongoing monitoring [1] - If biomass burning and fireworks are factored in, air quality could potentially improve by 1-2 levels compared to current predictions [1]