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| smoke fog | |||
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| haze; mist | |||
| haze Reduced visibility in the air as a result of condensed water vapour, dust, etc., in the atmosphere; mist Fine water droplets suspended in the air, which reduce visibility. Usually mists form at night, when the temperature falls because the sky is clear. If visibility falls below 1,000 metres, the mist becomes a fog | |||
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| smog | |||
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