北京12月8日电 据生态环境部官网消息，近日，中国环境监测总站联合中央气象台、国家大气污染防治 攻关联合中心，东北、华南、西南、西北、长三角区域空气质量预测预报中心和北京市生态环境监测中 心，开展12月上半月(12月1日—15日)全国空气质量预报会商。 12月上半月，受多轮冷空气影响，全国空气质量整体以优良至轻度污染为主，其中华北中南部、华东中 北部、西北东部、两湖局地、川渝、贵州等地可能出现中度及以上污染。受沙尘天气影响，新疆南部部 分城市可能出现中度及以上污染。 京津冀及周边地区：12月上半月，前期多冷空气扰动，区域空气质量以优良为主，局地可能出现轻度及 以上污染；后期部分时段扩散条件转差，区域中南部以轻度污染为主，局地可能出现中度污染。其中， 1—2日，受高压系统持续影响，扩散条件有利，空气质量以优良为主；3—5日，北部有间歇性偏北气流 扰动，中南部以偏南风为主，扩散条件较差，中南部空气质量以良至轻度污染为主，局地5日可能出现 短时中度污染；6—7日，北部受较强偏西北气流影响，扩散条件较好，中南部以偏南风或静小风为主， 空气质量以良至轻度污染为主，局地可能出现中度污染；8—10日，区域大部受弱偏南气流影 ...

Core Viewpoint - The overall air quality in China during the second half of November 2025 is expected to be predominantly good to lightly polluted, influenced by multiple cold air masses, with specific regions experiencing moderate pollution levels due to local conditions such as dust storms and temperature variations [1]. Summary by Region Beijing-Tianjin-Hebei and Surrounding Areas - The air quality is expected to range from good to lightly polluted, with specific dates showing variations due to cold air influences and changing weather patterns [2]. - From November 16-17, the air quality is predicted to be good, while from November 25-27, conditions may worsen to lightly polluted due to a weakening pressure system [2]. Beijing - The air quality is anticipated to be predominantly good, with potential pollution events during cold air intermissions [3]. - Notable dates include November 22-23, where conditions may lead to light to moderate pollution due to increased humidity [3]. Yangtze River Delta - The air quality is expected to be lightly polluted in the northern part, with short-term moderate pollution possible, while the southern part remains predominantly good [4]. - Specific dates indicate varying conditions, with November 16 showing poor dispersion leading to light to moderate pollution in the northern region [4]. Fenwei Plain - The air quality is generally good, with potential for localized light pollution during cold air intermissions [5]. - The period from November 22-24 may see light pollution due to dust transmission from upstream sources [5]. Northeast Region - The air quality is expected to be predominantly good, with light to moderate pollution possible during warmer periods [6]. - Cold air activity is expected to maintain good dispersion conditions, particularly from November 16-21 [6]. South China - The air quality is expected to be predominantly good, with localized light to moderate pollution possible due to ozone and particulate matter [7]. - Specific dates indicate variations, with November 16 showing generally good conditions but localized pollution in certain areas [7]. Southwest Region - The air quality is expected to be good overall, with localized light pollution in the Chengdu-Chongqing area during certain periods [8]. - The influence of cold air and precipitation is expected to improve air quality towards the end of the month [8]. Northwest Region - The air quality is expected to be generally good, with potential light pollution due to dust storms on specific dates [8]. - The period from November 21-24 may see moderate pollution levels due to significant dust weather processes [8]. Xinjiang Region - The air quality is expected to be predominantly good, with localized light to moderate pollution in southern cities due to dust storms [8]. - Specific dates indicate potential for heavy pollution in certain areas during dust events [8].

Core Viewpoint - The overall air quality in China during the first half of September 2023 is predominantly good, influenced by precipitation and cold air, with localized ozone pollution expected in some areas [1][2][3][4][5][6] Summary by Region Beijing-Tianjin-Hebei and Surrounding Areas - The air quality is mainly good, with slight pollution in some southern cities during specific periods due to temperature fluctuations and varying air flow [1][2] Yangtze River Delta - The air quality is generally good to lightly polluted, with localized areas experiencing light pollution due to high-pressure systems and precipitation [2] Fenwei Plain - The air quality remains predominantly good, with slight pollution in eastern areas, influenced by precipitation and temperature increases [3] Northeast Region - The air quality is mostly good, with potential light pollution in certain areas due to cold air and precipitation [4] South China - The air quality is primarily good, with some areas experiencing light pollution, particularly in central and northern regions [5] Southwest Region - The air quality is mainly good, with some cities experiencing light pollution due to temperature increases, while overall conditions are favorable [5] Northwest Region - The air quality is generally good, with localized light pollution and potential moderate pollution in southern Xinjiang due to dust storms [6]

Core Insights - The "Nanjing Air Quality Numerical Model WRF-CMAQ System" has been successfully validated, significantly enhancing air quality forecasting capabilities in Nanjing [1][2] - The system employs a dual model linkage innovation, with a grid resolution refined from 27 kilometers to 1 kilometer, allowing for detailed pollution tracking at the street level [1][2] Group 1: System Features - The system features a four-layer grid design that provides comprehensive coverage of Nanjing, with the innermost grid acting as an "environmental microscope" to detect pollution changes [1] - The accuracy of forecasts has improved by over 30% compared to traditional methods, with a 24-hour Air Quality Index (AQI) forecast accuracy of 94.4% [2] Group 2: Technological Innovations - The development team conducted over 300 experiments to optimize meteorological parameters and reduce wind speed errors, enhancing precipitation forecast accuracy [2] - A dual emission inventory system was established, incorporating machine learning for weekly calibration, which has improved the accuracy of PM2.5 simulations and vehicle nitrogen oxide emissions calculations [2] Group 3: Impact and Applications - Since its implementation, the system has produced over 200 high-quality forecasts and generated more than 20 mid- to long-term pollution source tracing reports, becoming essential for regional air quality management [2] - The system represents a shift in Nanjing's air quality monitoring from human-led to intelligent-driven approaches, facilitating proactive pollution prevention strategies [2]

Core Viewpoint - The article discusses the air quality forecast for the second half of June, indicating that while most regions will have good air quality, the Beijing-Tianjin-Hebei region and the Fenwei Plain may experience light to moderate pollution due to high temperatures and dust storms [1]. Group 1 - The National Environmental Monitoring Station, in collaboration with various meteorological and environmental agencies, conducted a nationwide air quality forecast for the latter half of June [1]. - Overall, the atmospheric diffusion and wet removal conditions across the country are expected to be favorable, leading to predominantly good air quality in most areas [1]. - However, high temperatures may lead to light to moderate pollution in the central and southern parts of the Beijing-Tianjin-Hebei region and the Fenwei Plain [1]. Group 2 - Dust storm conditions may cause moderate or higher levels of pollution in parts of eastern and southern Xinjiang during certain periods [1].