Harms to lungs arise in many ways. A new global collaboration estimates about 2.5 million annual, early deaths from air pollution, which is defined in general as ozone and particulates. The study is freely available here in full text in a respected journal, and a ScienceDaily summary is here. The study is an effort at modeling using Monte Carlo analysis and other statistical methods, and so the numbers are variable, both higher and lower.
The conclusion states the specifics: