And before a country devotes money to cleaning up its air, land and water, it must make a major commitment to do so — which won’t happen in Russia, for example, as long as its leaders believe manmade climate change is a hoax.

That's bullshit. You don't need to "believe climate change" in order to address city air pollution. A brief search gives articles like this going into details and numbers that there's a progress albeit slow. Also AQI shows quite a different picture.