华北南部黄淮等地霾天气逐渐减弱或消散

Core Viewpoint - The air quality in various regions of China is expected to improve due to the influence of cold air, with significant reductions in haze and fog conditions reported across multiple areas [1][2][3][4][5][6][7][8][9]. Group 1: Air Quality Forecast - On December 20, haze conditions in southern North China, Huanghuai, Jianghuai, Jianghan, and northern Jiangnan are gradually diminishing [1] - From December 21 to 25, most of the country will experience favorable atmospheric diffusion conditions, with no large-scale haze events expected [1] - However, from December 21 to 22, southern North China will have poor diffusion conditions, leading to light haze in some areas and moderate haze in localized regions [1][2] Group 2: Regional Specifics - In the Beijing-Tianjin-Hebei region, haze will gradually weaken on December 20, with light to moderate haze expected on December 21 and 22 [2] - The Yangtze River Delta will experience light to moderate haze due to upstream pollution on December 20, with some areas facing heavy haze temporarily [3] - The Fenwei Plain will generally have good atmospheric diffusion conditions, but light haze may occur during cold air intervals [4] - In Central China, light to moderate haze is reported in parts of Hubei, Hunan, and northern Jiangxi on December 20, with improved conditions from December 21 to 25 [5] - The Pearl River Delta is expected to have good atmospheric diffusion conditions throughout the week, with no large-scale haze [6] - In the Southwest region, parts of the Sichuan Basin will experience intermittent light haze [7] - The Northeast region will generally have good diffusion conditions, but light haze may occur in western Jilin and southern Heilongjiang during cold air intervals [8] - In the Northwest region, light haze is expected in parts of the northern Tianshan area, with dust or floating dust in parts of southern Xinjiang [9]