Discussion
Which visibility threshold defines fog rather than mist?
Answer: C
By international convention the obscuration is called fog when the horizontal visibility falls below one kilometre and mist when it lies between one and five kilometres. Both consist of water droplets, whereas haze consists of dry particles and is reported separately. Aviation practice adds further categories for very low visibility, since the operational consequences differ sharply below two hundred metres. Knowing the thresholds matters because the reported category rather than the measured value drives many procedures.
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