Here's what smog in London looked like back in the '50s and '60s and during The Great Smog, verses what the smog looks like this week.
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Smog-like conditions in London and across the UK are being caused by a mixture of local and continental pollution, as well as dust from the Sahara.
Here's what smog in London looked like back in the '50s and '60s and during The Great Smog, verses what the smog looks like this week.