still better to walk or cycle to work even with all this air pollution

Walk or get the bus?
But with all this talk of air pollution you have to think about this. What is best for your health. A team has looked into this comparing the effects of exercise on life expectancy with pollution in world cities and they concluded that walking and cycling are the best option for your health.
There are some notable exceptions; Delhi, Karachi and Doha. Even in Delhi, the most polluted city in the world you would need to cycle over 5 hours a week before the harm from air pollution outweighed the health benefits
However we do need to bring down air pollution and if more people switched to walking to work then this would mean less cars so it would be a win-win.
have a read of the full article in Preventative Medicine