The majority of people live inhabit the most densely populated most polluted and poorest inner areas of largest cities. For the reasons that they grew up in and don't know any better. Are unable to because they cannot afford any better, are lacking in social mobility.
They cannot make a move maybe because as the saying goes, “The Devil You Know Is Better Than The One You Don’t”. Or “If it ain’t broke don’t fix it“. Fear of the Unknown! Or Fear a similar or even worse outcome.
Those who could afford to move out already left. The solution is not escape responsibility.
In areas where dry climates prevail rain is seldom. When it rain, the air pollution levels drop considerably, however only temporarily. Afterwards the dry polluted conditions return to remain in place.
GMO Engineered Foods impair health. Organic Natural Foods are naturally healthier.
The details the extent of toxic food industry, please read article here.
Global Warming Climate Change (Air-Pollution) events affect a regional area. Hundred’s of years ago people traveled using land animals. Switching to renewable natural energy run motors, from Solar, Wind, Electricity, and Hydrogen, could ameliorate polluting effects on Climate.
Matter is Un-destroyed. Oil removed extracted from underground Earth changes form. As fuel releasing atmospheric gas trapping more Sun light. Melting glaciers, causing extreme weather and air pollution.