Let's be realistic. Removing speed humps is not going to miraculously clean the air, it might be a small improvement, but it's a drop in the ocean.
It might be better to plant more trees along busy roads. They've been proven to absorb huge amounts of pollution. I saw a program where they tested this theory by placing large potted silver birches (one of the most effective at filtering) along the frontage of of a house then compared the pollution levels inside with a house next door that was exposed to the road over a number of weeks. The results were very surprising.
Put something back into the environment instead of cutting down pollution absorbers then inexorably covering every green space with yet more concrete and emission producers.
To be honest, I don't have faith in society to get out of this mess.
I've studied courses on the environment and I remember that it was noted that there was a general trend of people moving to and living in cities, with architects envisaging a kind of Utopia where everyone lives in harmony with plenty of space and clean air around them.
I can't see it at the moment, at least not here. I hope that more people do become more urbanised, and I'll stay out in the countryside thanks!
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