smog

While that smog case wasn’t successful, Diamond remained a committed environmentalist.

Agencies frequently use thermal imaging during large wildfires to find hot spots during periods when there is no visible light or in conditions with heavy smog or mist.

Whether it is caused by wildfires, urban smog or any other source, the overwhelming evidence is that breathing it in is bad for a person’s respiratory health.

It was a couple of weeks after the great smog had brought London to a standstill, and although that particularly foul miasma had dispersed, smog still regularly reduced visibility.

They have warned the most immediate threat is volcanic smog which could reach inhabited areas downwind.