The article's about air pollution, and the author wants to do something about that. That's what he cares about right now. Those other things? Very bad. But: thi

The article's about air pollution, and the author wants to do something about that. That's what he cares about right now. Those other things? Very bad. But: this article's about this specific thing. Read the list of "other things" carefully. They all contribute to poor air quality / air pollution!