印度德里11月13日超过拉合尔成全球污染最严重主要城市：IQAir空气质量指数334达危险级，印度中央污染控制委员会读数403评为严重级
印度德里消息，印度首都德里 11 月 13 日周五超过巴基斯坦拉合尔，成为全球污染最严重的主要城市，空气质量达到危险水平，浓雾笼罩这座 2000 万人口的城市、能见度下降。据路透社报道，瑞士机构 IQAir 测得德里空气质量指数为 334，属危险级，为全球主要城市中最高。
印度官方的中央污染控制委员会给出的读数更高，为 403，评级为严重级。路透社说，瑞士与印度的读数不同，是因为两套空气质量指数的量表与计算、分类方法不同；指数读数在 50 以内属良好，健康风险很小或没有。
新闻机构 ANI 的视频显示，汽车与摩托车从浓重的雾霾中驶出，雾霾还遮住了该市主要道路上的路灯。
路透社说，污染是印度北部与邻国巴基斯坦许多地方的季节性问题：冬季寒冷沉重的空气把汽车尾气、建筑扬尘与农业焚烧的烟雾困在低空。
Delhi Overtakes Lahore on November 13 as the World's Most Polluted Major City: IQAir Reads the Air Quality Index at a Hazardous 334, While India's Central Pollution Control Board Reads 403 and Rates It Severe
DELHI, India — India's capital Delhi overtook Lahore in Pakistan on Friday, November 13, to become the world's most polluted major city, with air quality reaching hazardous levels and visibility dropping as smog blanketed the city of 20 million people, Reuters reported. The air quality index in Delhi was hazardous at 334, making it the most polluted global major city, according to Swiss group IQAir, which measures air quality levels based on the concentration of toxins.
India's official Central Pollution Control Board pegged the index higher at 403 and rated it severe. The Swiss and Indian readings vary due to the different scales and methodologies used to calculate and classify air pollution levels, Reuters said. An index reading up to 50 is considered good, with little or no health risk.
Cars and motorcycles emerged from dense smog, which also appeared to obscure street lights on the city's main roads, videos from news agency ANI showed.
Pollution is a seasonal problem in many parts of northern India and neighbouring Pakistan, as the cold, heavy air of winter traps vehicle emissions, construction dust and smoke from agricultural burning, Reuters said.
来源：路透社
发布：GSM·美国（发布链接）
图片来源：图：印度德里雾霾中的街道（资料图，2019 年摄，本稿所涉城市）。图中是雾霾笼罩下的德里街道与车流。作者与授权：Prami.ap90，CC BY-SA 4.0，维基共享资源。 / Photo: Air pollution over Delhi in 2019 (file photo). Wikimedia Commons (Prami.ap90, CC BY-SA 4.0).
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