9 million a year is not hard to believe. A LOT of people in China are smokers or ex smokers. That weakens their lungs and Chinese air pollution takes care of the rest.
Every DAY 8.9 million people die from something.

Then there’s India.

India, China or elsewhere, pneumonia is the final cause of death for a lot of elderly, terminally ill from from sorts of a non-pollution-related ailments. Almost any form of respiratory arrest runs a close second.

Cancer of just about any body part usually ends in pneumonia-death. Ditto with AIDS.

Any number of those respiratory deaths could be attributed to not living in a plastic bubble.