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BEIJING (AP) — Visibility shrank to less than half a football field and small-particle pollution soared to a record 40 times higher than an international safety standard in one northern Chinese city as the region entered its high-smog season.
The Great Smog of ’52 or Big Smoke was a severe air-pollution event that affected London during December 1952. A period of cold weather, combined with an anticyclone and windless conditions, collected airborne pollutants mostly from the use of coal to form a thick layer of smog over the city. It lasted from Friday 5 to Tuesday 9 December 1952, and then dispersed quickly after a change of weather.
Although it caused major disruption due to the effect on visibility, and even penetrated indoor areas, it was not thought to be a significant event at the time, with London having experienced many smog events in the past, so-called “pea soupers“. However, government medical reports in the following weeks estimated that up until 8 December 4,000 people had died prematurely and 100,000 more were made ill because of the smog’s effects on the human respiratory tract. More recent research suggests that the total number of fatalities was considerably greater, at about 12,000.
It is known to be the worst air-pollution event in the history of the United Kingdom, and the most significant in terms of its effect on environmental research, government regulation, and public awareness of the relationship between air quality and health. It led to several changes in practices and regulations, including the Clean Air Act 1956.
北京（AP） – 能见度缩减至不到一半足球场和小颗粒污染飙升至创纪录在一个中国北方城市的国际安全标准的40倍以上，作为该地区进入高烟雾季节。
北京（AP） – 能見度縮減至不到一半足球場和小顆粒污染飆升至創紀錄的在一個中國北方城市的國際安全標準的40倍以上，作為該地區進入高煙霧季節。
北京（AP） – 地域は、その高スモッグシーズンに入った可視性が半分以下のサッカー場と小粒子汚染に縮小した一中国北部の都市の国際的な安全基準よりも40倍高いレコードに急騰した。
베이징 (AP) – 지역의 높은 스모그 시즌을 입력으로 가시성이 절반 이하 축구 필드와 작은 입자 오염 감소 하나 중국 북부 도시의 국제 안전 기준보다 40 배 높은 기록에 상승했다.
ПЕКИН (AP) – Видимость сократилась до менее чем половины футбольного поля и малые частицы загрязнений взлетели до рекордных 40 раз выше, чем международный стандарт безопасности в одном северном китайском городе как область вступила в высоком смога сезона.
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