I never could smell the pollution in Bangkok. I don't think people in LA could smell the smog. Certainly when we had wildfire smoke here near Seattle a couple years ago, I could not always smell it. Sometimes when it was heavy, you could smell smoke right when you went outside, but not always... and your nose gets used to it really quickly. But like, that was pollution you could see, the skies were dark and orange. Not really typical pollution levels that people live in every day.