I wish it was! Not to worry though, that doesn't happen often, in fact I've never seen it so bad, it rarely goes much over 200, and that's uncommon. The steelworks is to the east of Swansea and the wind usually blows from the west, so it's rarely a problem. Even when it does blow from the east the pollution is usually quite mild, unless the wind speed is very low, when it builds up.

Port Talbot Steelworks is the largest in the UK and one of the largest in Europe. Sucks that I just happen to live near to it, one of the worst polluters in the UK.
https://en.wikipedia.org/wiki/Port_Talbot_Steelworks

Initially I thought this was a Cities: Skylines screenshot.

Bah, that south easterly wind

And i thought my smoking neighbors were bad. YOWZA!

wow that is horrific