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smog + verb
smog 通常作不可数名词，谓语动词用单数。
Smog hangs over the city in winter.
冬天烟雾笼罩着城市。
烟雾
先理解核心含义，再看它在真实句子里的用法。
烟雾
a form of air pollution that is a mixture of smoke and fog
Smog hangs over the city in winter.
冬天烟雾笼罩着城市。
城市空气污染产生的有害颗粒物和气体混合物。
A noxious mixture of particulates and gases that is the result of urban air pollution.
烟雾混合造成的空气污染
air pollution by a mixture of smoke and fog
The city was covered in thick smog this morning, so many people wore masks.
今天早上城市被浓密的烟雾笼罩，所以许多人戴上了口罩。
Air quality alerts warn us when smog levels are dangerous for children and the elderly.
空气质量警报会在烟雾水平对儿童和老人危险时提醒我们。
Factories have reduced emissions to help cut down the smog that often hangs over the valley.
工厂减少了排放，以帮助减少经常笼罩山谷的烟雾。
smog 通常作不可数名词，谓语动词用单数。
Smog hangs over the city in winter.
冬天烟雾笼罩着城市。
a layer/blanket of smog 用来描述烟雾的厚度或范围。
A thick blanket of smog covered the valley.
一层厚厚的烟雾笼罩着山谷。
被动结构 be covered in smog 强调被烟雾笼罩的状态。
The city was covered in smog all day.
这座城市一整天都被烟雾笼罩。
Not this
There are many smogs in the city.
Use this
There is a lot of smog in the city.
smog 通常作不可数名词，不用复数形式，也不用 many 修饰；要表示大量烟雾，应用 a lot of / much 等修饰不可数名词的结构。
Not this
The sky is smog.
Use this
The sky is smoggy.
smog 是名词，意为“烟雾”，不能用作表语来形容天空；表示“多烟雾的”要用形容词 smoggy。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
浓重的烟雾
Thick smog reduced visibility to less than 100 meters.
浓重的烟雾使能见度降到不足100米。
烟雾警报
The government issued a smog alert for tomorrow.
政府发布了明天的烟雾警报。
烟雾污染水平
Smog levels in the capital reached record highs.
首都的烟雾污染水平达到了历史新高。
光化学烟雾
Photochemical smog is common in sunny cities with heavy traffic.
光化学烟雾在阳光充足、交通繁忙的城市很常见。
城市烟雾
Urban smog is a serious health concern.
城市烟雾是一个严重的健康问题。
Use smog naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
smog 像 smoke（烟）和 fog（雾）拼在一起，记住“烟+雾=烟雾”，雾霾天就是 smog。
语域：neutral 常见场景：news reports、environmental discussions、daily conversation about air quality “smog” 是中性常用词，通常用于新闻报道、环境讨论以及日常谈论空气质量，正式和非正式场合都比较常见。
These words share the exact /ɑɡ/ rhyme with smog: bog, cog, fog, jog. Be careful with spelling lookalikes such as dog, which is often pronounced /dɔɡ/ and does not rhyme with smog /smɑɡ/ in many accents.
Dictionary facts from ECDICT, WIKTIONARY.