另据北京市生态环境局17日发布，北京市将于2025年12月18日0时启动空气重污染黄色预警。据介 绍，根据空气质量最新预报情况，预计12月18日至12月19日，北京市空气质量可能达到4级中度污染。 20日起，受冷空气影响，北京空气质量将改善至优良。 新华社北京12月17日电（记者田晨旭）北京市气象台12月17日17时10分发布大雾黄色预警信号：预 计12月17日夜间至12月18日上午，北京市有雾，能见度小于1000米，房山、大兴、通州、朝阳及平谷南 部等区域能见度不足500米，请注意防范。 气象部门提示，大雾黄色预警信号期间，请公众关注交通信息，出行尽量选乘公共交通工具。驾驶 人员注意路况，减速慢行，如遇交通事故及时报警求助，远离车辆、火源等事故危险区域。生态环境部 门提示，空气重污染黄色预警期间，建议儿童、老年人和呼吸道、心脑血管疾病及其他慢性疾病患者尽 量留在室内，避免户外活动。中小学、中等职业学校、幼儿园根据属地空气污染情况适时减少户外活 动。（完） 按照《北京市空气重污染应急预案（2023年修订）》规定，北京市空气重污染应急指挥部办公室定 于2025年12月18日0时启动空气重污染黄色预警，请广大市民 ...

有毒烟雾是新德里及周边地区频繁出现的问题，冬季尤为严重，主要原因包括工业排放、车辆尾气、气 温下降、风速低以及邻近地区季节性焚烧农作物秸秆等多重因素。 英国广播公司（BBC）报道称，根据政府推出的一款应用程序，新德里周一早上的平均AQI为471。按 照印度空气污染监管机构的划分，AQI水平超过400为严重。《印度时报》报道称，新德里多个监测站 的AQI指数已达500，为测量数据峰值。 印度空气质量管理委员会（CAQM）已启动了其分级响应行动计划的最高级别，以应对污染问题。 【环球时报综合报道】据美联社16日报道，印度首都新德里近日出现严重的空气质量问题，影响能见度 并导致航班和火车延误。 按照计划要求，老旧柴油货车被禁止进入德里，建筑工程暂停施工，年幼的孩子转为线上教学，公司也 可允许员工线上办公。 报道称，有毒烟雾导致超40个航班被取消，数十个航班延误。印度政府表示，超过50列进出新德里的火 车延误数小时。当天该城市的空气质量指数（AQI）超过了世界卫生组织建议限值的30倍。 印度联邦政府本月初发布的一项报告称，随着首都地区空气污染程度的不断加重，2022 年至2024年之 间，新德里6家公立医院记录了超2 ...

Core Points - The temperature in Kathmandu, Nepal has significantly dropped, with the minimum temperature recorded at 7.4 degrees Celsius, a decrease of 3 degrees from the previous week [1] - The air quality in Kathmandu has worsened due to increased consumption of heating fuels and the burning of leaves and crop residues, leading to a rise in air pollution [2] Group 1 - The recent cold wave is linked to seasonal changes, with expectations of further drops in temperature during early mornings and evenings [1] - Kathmandu's maximum temperature was recorded at 19.2 degrees Celsius, lower than the previous week's 20.2 degrees Celsius [1] - The air quality index (AQI) in Kathmandu exceeded 100, indicating poor air quality [2] Group 2 - Environmental experts noted that the lack of winter rainfall and reduced wind speeds hinder the dispersion of smoke and dust in the valley [4] - Kathmandu frequently ranks among the cities with the worst air pollution during this time of year due to various factors including vehicle emissions, road dust, and industrial discharges [4]

一是弱东南风、贴地逆温、高湿大雾等因素叠加，京津冀中部气象条件非常不利。11月4日至5日，区域 受持续弱东南风控制，存在系统性贴地逆温，大气扩散条件较差；最高相对湿度超过90%，促进污染物 的化学转化。特别是5日京津冀中部位于风场辐合区，边界层低至300米，且出现大雾天气，造成北京及 周边污染明显加重。 二是区域污染物排放强度仍然较大，高湿条件下氮氧化物等气态污染物二次转化影响显著，部分时段存 在燃烧源影响。近期区域内陆续启动供暖，同时区域机动车、工程机械活动水平居高不下，导致氮氧化 物等气态污染物排放增加。从颗粒物组分特征来看，典型城市北京在污染高值时段，组分重构以硝酸盐 主导，占比达51.8%。此外，部分时段受燃烧源排放影响较为明显。 三是京津冀及周边地区还受到安徽北部的污染传输影响。11月3日至4日，安徽北部宿州、亳州、蚌埠等 地秸秆火点密集多发，导致局地空气质量快速转差。宿州连续出现13小时的重度及以上污染，高值时段 有机物占比达到八成。在东南风作用下，安徽北部的污染气团向北移动，对京津冀及周边地区PM2.5浓 度升高有一定贡献。 从目前预报分析来看，预计11月6日至7日区域北部污染略有缓解，8日至1 ...

新京报讯（记者张璐）北京市生态环境监测中心数据显示，今天（11月5日）18时，北京空气质量指数 为209，达到五级重度污染水平，首要污染物为PM2.5。 5日夜间，受低压控制，湿度大，扩散条件不利，预计首要污染物为PM2.5，空气质量指数为190-210， 达到4-5级中度污染-重度污染水平。6日白天，受东北高压控制，湿度较大，扩散条件偏不利，预计空 气质量指数为135-155，轻度污染水平。7日，预计空气质量将恢复至2级良。 受不利气象条件影响，北京正在经历一次空气污染过程。本地排放叠加区域传输，北京PM2.5浓度持续 升高。今天中午，空气质量达到中度污染水平；17时，空气质量达到重度污染。 ...

Core Viewpoint - The Beijing-Tianjin-Hebei region and surrounding areas are expected to experience an air pollution event from November 4 to 8, with peak pollution levels potentially reaching moderate to heavy pollution [1] Group 1: Air Quality Forecast - The first PM2.5 pollution event of the autumn-winter season ended on November 2, leading to improved air quality [1] - As of November 4, the hourly PM2.5 concentration peaked at 128 micrograms per cubic meter [1] Group 2: Meteorological Conditions - The overall weak cold air activity and higher-than-normal temperatures in late October to early November are unfavorable for pollution dispersion, contributing to frequent pollution events [1] - From November 4 to 5, adverse atmospheric diffusion conditions are expected to worsen, with November 6 predicted to be the most unfavorable day for air quality [1] Group 3: Emission Levels - Increased operational rates in industries such as cement, brick, and ceramics, along with a rise in heavy truck traffic, are contributing to elevated emission levels [2] - The ongoing testing and ignition of heating equipment, along with numerous open burning sites, are further raising regional emissions [2] Group 4: Pollution Severity - From November 4 to 5, light to moderate pollution is anticipated in the central and southern parts of the region, while from November 6 to 8, slight improvements in diffusion conditions may lead to good air quality in the northern areas, with light to moderate pollution persisting in the central and southern regions [2] - Heavy pollution is likely in cities in southern Hebei and northeastern Henan on November 6 [2]

从气象条件来看，未来三天，区域中南部出现风场辐合、近地面逆温、弱降水增湿等多重不利因素。11 月4日至5日，大气中层温度升高，地面以南风为主，大气扩散条件逐步转差。6日，区域北部转受东北 风控制，南部受偏东风影响，河北中南部、河南北部污染气团难以扩散；区域中南部出现贴地逆温、分 散性降水，既抑制污染垂直扩散，还会增湿加剧污染程度；预计这是污染过程期间气象条件最为不利的 一天。 从排放水平来看，10月末至11月初，区域内水泥、砖瓦、陶瓷等生产工序可中断行业开工率同比上升3 个百分点，重型货车交通流量增加7%，工程机械开工时长上升10%。此外，近期多地正在进行供暖设 备调试和点火试运行，环渤海、太行山沿线、安徽北部露天焚烧火点较多，将进一步抬升区域排放水 平。 气象条件不利叠加区域排放增加，导致污染过程频繁 11月2日，上次污染过程基本结束，京津冀及周边地区空气质量恢复优良。3日，随着区域北转南风， PM2.5污染逐渐累积，河南大部、河北南部和山东北部出现小时轻度污染。截至4日10时，区域内PM2.5 小时浓度峰值为128微克/立方米（漯河，4日7时）；北京市PM2.5浓度从2日的"个位数"水平，持续增长 至48 ...

Core Points - The air pollution issue in major Indian cities has gained significant attention as winter approaches and the Diwali festival leads to increased firework usage [1][3] - India's environmental monitoring systems are under scrutiny due to serious technical flaws, which undermine public trust and could jeopardize India's international reputation in environmental monitoring [3][4] Group 1: Air Quality and Pollution - The air quality index (AQI) in New Delhi reached 350, categorized as "very poor," primarily due to traditional fireworks and vehicle emissions [3] - Reports indicate that 13 out of 24 air quality monitoring stations in New Delhi do not meet technical standards, leading to potential data distortion [3] Group 2: Environmental Monitoring Systems - The environmental sensors in New Delhi, despite being costly, lack independent oversight, raising concerns about the reliability of the monitoring data [4] - There is a call for stricter installation standards and independent expert guidance to enhance the credibility of the monitoring systems [4] Group 3: Government Measures and Recommendations - The Indian government has implemented measures to curb pollution, including regulating construction activities and limiting diesel generator usage [4] - Environmental advocates emphasize the need for ongoing clean energy development and stricter vehicle emission regulations as long-term solutions [4]

Core Insights - A recent study by multiple Indian research institutions indicates a significant decline in sunlight hours across India over the past 30 years, impacting energy, agriculture, and public health sectors [1][3] Energy Sector - The reduction in sunlight hours poses challenges for India's energy strategy, particularly for solar power, which is a cornerstone of the country's climate and energy policy [5] - Solar energy accounts for nearly 47% of India's renewable energy installed capacity, with a target to reach 500 GW by 2030 [5] - As of early 2025, India's cumulative solar installed capacity is projected to exceed 100 GW, but decreasing sunlight due to pollution threatens this foundation [5] Agriculture Sector - The decline in sunlight is adversely affecting agriculture, especially in regions like Punjab, Haryana, and Uttar Pradesh, where farmers report slower crop growth and increased risks of fungal diseases [5] - Estimates suggest that in severely affected areas, staple crop yields could decrease by over 30% [5] Public Health - Insufficient sunlight is believed to impact human hormone levels and circadian rhythms, leading to decreased alertness and disrupted sleep cycles [5] - Psychological issues such as fatigue, anxiety, seasonal affective disorder, and vitamin D deficiency are associated with reduced sunlight exposure [5] Environmental Context - The phenomenon of declining sunlight is attributed to increased aerosol particles and thicker cloud cover, exacerbated by severe air pollution in India [4] - India ranks among the top ten countries globally for pollution severity, driven by rapid urbanization and industrial growth [4] International Comparisons - Similar issues of reduced sunlight due to industrial emissions have been observed in Europe, which experienced a recovery in sunlight hours following the implementation of environmental policies in the late 1990s [6] - China has also reversed its trend of declining sunlight through strict environmental regulations, providing a potential model for India [6]

Core Viewpoint - Eastern Canada is facing a dual challenge of high temperatures and air pollution, with health advisories issued by the Canadian government [1] Group 1: Weather Conditions - The Canadian Environment Department has issued heat warnings for multiple regions in Eastern Canada, with daytime temperatures expected to reach between 29 to 32 degrees Celsius [1] - The perceived temperature in these areas could range from 35 to 40 degrees Celsius, indicating a significant heat impact on residents [1] Group 2: Air Quality - An air quality alert has been issued due to smoke from wildfires in Northern Ontario, leading to deteriorating air quality in the Greater Toronto Area [1] - On the 14th, the air quality in this region ranked among the worst globally, highlighting severe pollution levels [1] - The Canadian Environment Department recommends that individuals reduce outdoor activities and keep windows and doors closed to mitigate health risks [1]