Air pollution tends to get worse before it gets better, but how can we accelerate this transition?

I’m lucky to have grown up with far cleaner air than my parents or grandparents did. In fact, air quality in the United Kingdom is now better than it was for several generations [...] For younger generations in many other countries, this is not the case. Those living in cities like Delhi, Dhaka, or Accra breathe in some of the most polluted air in their country’s history.