根据预测，21日下午至夜间，北京市受低压后部高压前部作用，西北风加强，外来沙尘逐渐影响北 京市大部分地区，预计下午至夜间PM10浓度水平显著上升，峰值浓度可达到500微克/立方米以上的严 重污染水平。由于风力较强，预计22日凌晨沙尘带逐步移出北京市，22日白天空气质量为1-2级优良水 平。 央视网消息：@北京环境监测 消息，受大范围强低压系统影响，2月20日白天至21日白天，蒙古国 西部、南部以及我国西北地区出现大范围沙尘天气，并随气流向东向南传输，我国西北部多地区PM10 达到5-6级重度-严重污染水平。受外来沙尘传输影响，京津冀区域西北部PM10浓度明显抬升，14时张 家口市PM10浓度达到2031微克/立方米，6级严重污染水平；北京市延庆区14时PM10浓度达到594微克/ 立方米，6级严重污染水平；全市平均PM10浓度为175微克/立方米，3级轻度污染水平。 ...

研究团队进一步对毕氏卵角蚁群体进行研究，发现当该种蚂蚁蚁穴长期暴露在臭氧环境中时，蚂蚁不仅 会"自相残杀"，工蚁还会逐渐放弃对幼虫的照料，最终导致整个蚁群崩溃的严重后果。 江南纪表示，本次研究表明，即使臭氧浓度轻微升高，也足以削弱蚂蚁的相互识别能力，并对其社会系 统造成严重影响——"这也提示，空气污染的生态风险可能不仅体现在个体生理损伤上，还可能通过破 坏物种间和种群内部的交流网络，放大其对生态系统稳定性的长期影响。" 空气污染不只会威胁人类健康，对自然界中其他生物的危害也超出人们的想象。近日，中国农业科学院 深圳农业基因组研究所（岭南现代农业科学与技术广东省实验室深圳分中心）江南纪课题组与德国团队 合作发现：空气污染物臭氧会破坏蚂蚁用于识别同类的化学信号，导致同巢蚂蚁"自相残杀"，还会使工 蚁停止照料幼虫，最终引发蚁群的崩溃。该研究成果于2月2日发表在《美国国家科学院院刊》。 中国农业科学院深圳农业基因组研究所研究员江南纪介绍，通常一个蚁巢由一只蚁后和许多工蚁构成， 就像一个小小的王国。其中，工蚁们高度协作，一起探索世界、捕获猎物、抚育幼蚁、喂养蚁后和抵御 外敌；蚁后专注于产卵，保证蚁群延续。 这样复杂的分 ...

【环球时报特约记者 李佳寅】"'有毒'空气正在威胁印度的2036年申奥愿景。"《今日印度》近日在专题节目中抛出话题，强调"空气问题如今已不仅是印度 人民的健康隐患，更是国家的负担"。报道举例说，包括羽毛球名将安赛龙、安东森在内的多名国际运动员，曾因对印度的空气质量表示担心而选择弃赛。 不仅是国外选手担忧前往印度参赛的健康问题，空气污染也严重影响到本国选手的训练质量和身体健康。普丽蒂·潘查尔曾担任2023年曲棍球世青赛印度队 队长，她讲述了日益严重的污染如何让自己饱受健康困扰。潘查尔坦言："空气污染直接影响了队员们的训练——跑步变得吃力，呼吸变得困难，不少曲棍 球队员都出现了过敏症状。训练馆附近还有一家大米加工厂，厂区产生的粉尘常年漂浮在空气中。受粉尘影响，训练场地草坪老化速度很快，还会变得湿 滑，导致队员们频繁受伤。我相信运动员总能学会适应和应对各种状况，但如果能有更好的训练环境，我们的竞技水平无疑能再上一个台阶。" 潘查尔和队友的遭遇不是个例。《印度快报》的一项调查显示，冬季重度空气污染叠加夏季逼近50摄氏度的酷热，正让印度顶尖运动员的训练周期遭遇"缓 慢且持续的侵蚀"。对于印度的顶尖运动员而言，训练已从对 ...

1月23日起至27日，大气扩散条件转差，预计污染范围扩大、程度升级。其中，1月23日，淮河以北空气 质量为中度至重度污染，江淮之间和沿江江南为轻度至中度污染，首要污染物为PM2.5。1月24日，受 偏东风影响，淮河以北和江淮之间空气质量为中度至重度污染，沿江江南为轻度至中度污染。1月25 日，受持续偏东风影响，全省空气质量为轻度至中度污染。 到了1月26日、27日，受弱西北风及偏东北风交替影响，淮河以北和江淮之间空气质量仍为中度至重度 污染，沿江江南为轻度至中度污染，首要污染物为PM2.5。 星报讯 1月21日，雪后放晴，安徽省环境空气质量预报显示，淮河以北和江淮之间空气质量以轻度污染 为主，沿江江南为良至轻度污染。 1月22日，大气扩散条件一般，淮河以北空气质量为轻度至中度污染，江淮之间以轻度污染为主，沿江 江南为良至轻度污染，首要污染物为PM2.5。 （来源：市场星报） ...

Core Viewpoint - The Sichuan Basin is expected to experience a prolonged regional pollution event due to persistent stable weather conditions, with significant air quality deterioration anticipated until around January 19, primarily affecting major cities in the Chengdu Plain, southern Sichuan, and northeastern Sichuan [1] Group 1: Pollution Forecast - The pollution event is expected to last until January 19, with the most severe pollution occurring from January 15 to 19, where some cities may face heavy pollution risks [1] - A total of 16 cities, including Chengdu, Zigong, Ya'an, and Ziyang, have initiated yellow alerts for heavy pollution, while Luzhou and Guang'an have escalated to orange alerts [1] Group 2: Response Measures - The provincial government is implementing a coordinated response strategy, emphasizing collaboration across departments to effectively manage the pollution [1] - Emergency response measures are being optimized, including differentiated control measures to avoid a one-size-fits-all approach, alongside increased supervision and enforcement of these measures [1] Group 3: Public Health Advisory - Vulnerable groups such as children, pregnant women, the elderly, and individuals with cardiovascular or respiratory conditions are advised to stay indoors and take necessary precautions if they must go outside [2] - The general public is encouraged to limit outdoor activities and take protective measures if outdoor exposure is unavoidable [2][3] - Schools and kindergartens may consider reducing outdoor teaching activities during this period [3] - Large outdoor events should be canceled during heavy pollution days, and the public is encouraged to adopt green travel practices, such as using public transportation and minimizing vehicle idling [4]

Core Viewpoint - Hefei's air quality has been reported to remain at a moderate pollution level over the past 24 hours, with an AQI index reaching or exceeding 150, indicating significant air quality concerns in the region [1]. Group 1: Air Quality Status - As of December 19, the air quality in Hefei has consistently been at a moderate pollution level, affecting residents' perception of the sky's clarity [1]. - The air quality index (AQI) reached or exceeded 150, categorizing it as moderate pollution [1]. Group 2: Meteorological Forecast - The meteorological department predicts that from December 21 to 22, northern Anhui will experience additional haze conditions [1]. - On December 19, the air diffusion conditions in the western and northern regions of the Yangtze River Delta were reported as average, with light to moderate haze present [1]. - A short-term intensification of haze weather is expected in most areas due to the transmission of upstream pollutants starting early on December 20 [1]. - From December 23 to 25, the region will benefit from improved air diffusion conditions due to the influence of cold air [1].

Core Viewpoint - Beijing is currently experiencing air pollution, but conditions are expected to improve, leading to a return to good air quality levels by Saturday [1][2] Group 1: Air Quality Status - As of today, Beijing's air quality is at a light pollution level, with PM2.5 concentrations reaching 79 micrograms per cubic meter at 16:00 on the 17th, indicating light pollution [1] - On the 18th at 08:00, PM2.5 concentrations rose to 116 micrograms per cubic meter, entering moderate pollution levels, and further increased to 148 micrograms per cubic meter by 16:00 [1] Group 2: Contributing Factors - The increase in PM2.5 levels is attributed to regional transmission, with 70% of the pollution being influenced by external sources, particularly from coal burning [1] - During the pollution event, coal source tracers in PM2.5 components increased by 6.6 times, indicating significant contributions from regional coal sources [1] - Local pollution accounted for 28% of PM2.5 levels, while regional transmission pollution made up 72%, highlighting the combined impact of local generation and regional transport [1]

Core Viewpoint - The air pollution process in the Beijing-Tianjin-Hebei region began on December 15, with PM2.5 concentrations reaching significant levels, indicating a deterioration in air quality due to unfavorable diffusion conditions and regional transmission of pollutants [1][2]. Overall Situation - On December 15, PM2.5 concentrations in cities near the Taihang and Yanshan mountains rose to light pollution levels, with Langfang experiencing moderate pollution. On December 16, under the influence of northern winds, pollutant concentrations decreased in the northern region while accumulating in the south, leading to widespread light pollution and moderate pollution at the Hebei-Shandong-Henan border. By December 17, pollution spread to the Yangtze River basin, reaching moderate to heavy pollution levels, and by December 18, severe pollution was reported in most of Henan and southern Hebei [1]. Pollution Cause Analysis - The pollution process was primarily driven by unfavorable diffusion conditions and local accumulation, compounded by regional transmission, which collectively raised PM2.5 concentrations in Beijing. Recent weak surface pressure systems and persistent warming in the middle atmosphere contributed to the formation of regional pollution [2]. Regional Transmission Impact - During the pollution event, regional transmission accounted for 72% of the PM2.5 concentration increase in Beijing, with coal combustion sources contributing significantly, as evidenced by a 6.6-fold increase in coal source tracers. The local contribution was only 28%, indicating that the majority of pollution was transported from surrounding areas, particularly from Hebei province [3]. PM2.5 Composition - The composition of PM2.5 during the pollution event showed a significant presence of nitrates, with nitrate, ammonium, and sulfate accounting for 39%, 16%, and 11% of the total PM2.5, respectively. Secondary components made up over 60% of the total, highlighting the need for enhanced control of emissions from mobile sources in Beijing [3]. Protective Recommendations - Forecast models indicate that the pollution process will only be alleviated after the arrival of cold air on the afternoon of December 19, improving diffusion conditions. Citizens are advised to minimize unnecessary travel and wear masks for protection until conditions improve [3].

Group 1 - The air quality in Beijing is currently at a moderate pollution level, primarily due to PM2.5, with similar pollution observed in eastern China [1] - Since December 14, air quality has deteriorated in the Beijing-Tianjin-Hebei region and surrounding areas due to reduced wind, increased humidity, and temperature inversions [1][2] - The current pollution process is attributed to unfavorable meteorological conditions combined with high emissions from various industries, leading to the accumulation and transformation of pollutants [2] Group 2 - In the Beijing-Tianjin-Hebei region, the activity level in the thermal power and heating sector has increased by approximately 20 percentage points compared to pre-heating season levels [2] - Key industries such as steel, petrochemicals, and construction are maintaining high operational levels, contributing to persistent PM2.5 pollution [2] - The proportion of nitrates in PM2.5 has exceeded 30%, indicating that emissions from key industries and diesel vehicles are significant contributors to pollution [2] Group 3 - In response to the pollution, 86 cities in the Beijing-Tianjin-Hebei, Yangtze River Delta, and central Yangtze River regions have activated early warning responses [2] - Specific measures include differentiated control strategies for industrial enterprises based on environmental performance, such as production halts and emission limits [2] - In Hubei province, nitrogen oxide emissions from industrial sources decreased by 10.1% as part of the coordinated response to pollution [3] Group 4 - Air quality in cities like Ezhou, Xiangyang, and Suizhou improved from heavy to moderate pollution levels by December 18 [3] - Public health recommendations include minimizing outdoor activities and using public transportation to reduce traffic emissions during poor air quality [3] - Air quality is expected to gradually improve in the Beijing-Tianjin-Hebei region starting December 20, with further improvements in the Yangtze River Delta and central Yangtze River regions on December 21 [3]

Group 1 - The Beijing Meteorological Station issued a yellow fog warning, predicting visibility below 1000 meters from the night of December 17 to the morning of December 18, with some areas experiencing visibility under 500 meters [1] - The Beijing Ecological Environment Bureau announced that a yellow alert for air pollution will be activated on December 18, 2025, with air quality expected to reach moderate pollution levels on December 18-19 [1] - Following the arrival of cold air on December 20, air quality in Beijing is expected to improve to good levels [1] Group 2 - During the yellow fog warning, the public is advised to monitor traffic information and prefer public transportation, while drivers should reduce speed and be cautious [2] - The ecological environment department recommends that vulnerable groups, such as children, the elderly, and those with chronic diseases, stay indoors during the air pollution yellow alert [2] - Schools are advised to reduce outdoor activities based on local air pollution conditions [2]