If your job requires you to be on the streets frequently, you are likely to be breathing in unhealthy air much of tile time. Anyone and everyone who works at street level suffers the most. For example, police officers on the beat, traffic wardens, tens of thousands of shopkeepers with street shop fronts, hawkers, road workers of all sorts, street newspaper vendors, postal delivery officers and other people in the delivery business. Even if you do not spend long periods at street level, you might spend some time every day walking around. Doctors are recording more pollution-related illnesses, particularly among the young.
Air pollution is a public health issue.
It is also a matter of social justice. We must increase car owners' knowledge of vehicle maintenance. Further, we need to work with south China to reduce its pollution.