Re air pollution, there’s already been significant improvement in wealthier countries, at least in the last ~century:
https://ourworldindata.org/grapher/emissions-of-air-pollutants?time=1970..2016&country=~GBR
https://ourworldindata.org/grapher/air-pollution-london-vs-delhi
More info: https://ourworldindata.org/outdoor-air-pollution#the-long-term-decline-of-air-pollution-in-rich-countries
Re air pollution, there’s already been significant improvement in wealthier countries, at least in the last ~century:
https://ourworldindata.org/grapher/emissions-of-air-pollutants?time=1970..2016&country=~GBR
https://ourworldindata.org/grapher/air-pollution-london-vs-delhi
More info: https://ourworldindata.org/outdoor-air-pollution#the-long-term-decline-of-air-pollution-in-rich-countries