Definition of brown cloud in English:

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brown cloud

Entry from US English dictionary

noun

A visible pall of air pollutants that persists over a city or other area: the Asian brown cloud throughout the day, air shifts in the valley cause variances in the brown cloud
More example sentences
  • Today, that is all gone: no brown cloud, no atmospheric pollution to speak of.
  • One look at the big brown cloud hanging perennially over Toronto and you know Rick Mercer is right: the first instinct is to run.
  • Over everything hangs a brown cloud of pollution that is clearly visible from the hills outside the city.
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