We still allow smoking in public and cars in cities including poisonous and carcinogenic diesel. No wonder we also don't care what kids breathe at school. It's

We still allow smoking in public and cars in cities including poisonous and carcinogenic diesel. No wonder we also don't care what kids breathe at school. It's just a result of convenience being valued higher than health even if the cost of convenience is ridiculous (like carrying a 2 ton metal box powered by a diesel engine everywhere you go in a city).