Why cities become covered in smoke | ABC News In-depth

A meteorological phenomenon called an inversion can act like a lid, trapping cool, dense air — with smoke or other pollutants mixed in with it — close to ground level. This is how it works. Subscribe: https://ab.co/3yqPOZ5 Read more here: https://www.abc.net.au/news/2023-09-13/sydney-smoke-haze-explained-temperature-inversion-burnoff/102844188

Sydney is the most recent city to be covered in an eerie smoke haze, a familiar sight to Australians during autumn and spring as fire crews make hazard reduction burns ahead of summer.

Air quality has hit very poor ratings across several Sydney monitoring districts since Monday, according to data from the NSW government, especially during the morning and evening periods.

Alexandria, in Sydney's east, on Monday had a fine particle pollution measurement of PM2.5 — worse than Beijing's 2022 average.

The grey skyline is a familiar sight across Australia during autumn and spring, as fire crews make hazard reduction burns ahead of summer.

So what causes it to become trapped, and how much more burning is due?

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