The end result is we get very high temperatures, so we can make steam for heavy industry, we can melt aluminum, we can melt steel, we can make concrete.
Meaning the pollution in your home can be several times worse than if you were standing right beside a highway with tons of car traffic or near heavy industry.
So, the massive freeway projects of the mid-20th century disproportionately cut through redlined neighborhoods, accompanied by heavy industry and pollution.
Local governments are struggling to find a balance between closing down heavy industry factories for cleaner air and maintaining growth and employment.