I attended elementary school in California in the late 70s/early 80s. We would have smog alerts when the air quality was so bad we couldn't go outside during r

I attended elementary school in California in the late 70s/early 80s. We would have smog alerts when the air quality was so bad we couldn't go outside during recess. California has been working on this since the late 60s. They were the first state to require better emissions controls on cars, they have tightened regulations on businesses and industries that would normally negatively contribute, and the push the problems of dirty power generation into other states.