Yeah it's not like China or Hong Kong... yet but I do tend to limit my running to the treadmill.
The smog is not too bad for normal life / travel plans but it's already bad enough to make jogging around downtown parks an unattractive proposition.
Considering it is a city of well over 10M (documented) people we are still doing quite well but the trend is not good. More and more cars coming online. All idling in traffic jams. Electric cars not feasible due to the heat... It's going to be a real challenge to keep air pollution in check without hindering growth.