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scale and severity of the smog was the worst in recent memory近期内雾霾涉及范围最广，程度最严重

be enveloped in the choking and hazardous smog

be blanketed in smog 被雾霾笼罩

visibility was reduced to less than 5 metres能见度减少到不到5米

in the worst hit places 雾霾最严重地区

air quality plummets in winter months 空气质量在冬季严重恶化

雾霾成因表达：

exhaust emissions from the massive numbers of cars 大量的车辆排放的尾气

coal burning, which releases large amounts of toxic gases(primarily sulfur dioxide)燃煤会释放大量有毒气体(主要是二硫化物)

combine these airborne pollutants with unfavorable weather(heat, lack of wind) and you get smog.大气污染物与不利天气(如气温高，无风天气)就会形成雾霾

disperse the pollution (风)吹散污染物

industrial pollution from the large concentration of steel and cement factories in the Yangtze River delta. 长江三角洲附近的重工业企业排放工业废料

雾霾的危害：

irritate your respiratory system 呼吸系统紊乱

lethal disease 致命疾病

延伸阅读：

雅思考官最不喜欢哪种写作方式

雅思写作提高方法：如何练习

雅思作文好开头要会编

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