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I definitely get a little worried about fumes, in a modern urban city. Diesel pollutants are local, and when I walk across a 4+ lane street with traffic, I always find myself practically gagging on exhaust fumes. That can't be healthy.

We should really ban big diesel rigs from areas with population density above a certain threshold. Especially considering how little the regulations around diesel emissions are actually complied with.

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> We should really ban big diesel rigs from areas with population density above a certain threshold.

I'd go much further than that. I'd ban all combustion engines in cities.

There are enough alternatives: Walking, bicycles, ebikes, trams, electric buses, trains, and electric cars.

We should try to keep the air as clean as possible in densely populated areas.

I think national emissions standards would also be nice. My state doesn't emissions test vehicles (not even commercial vehicles), and it's obvious when you're driving or biking behind someone with a clearly malfunctioning car. Ick.

You can really tell how much cleaner modern cars are though, when you pass a "classic" 1950 - 1970s model on the road. You can smell the unburned fuel/exhaust distinctly. And back in the day you'd have gotten a dose of lead along with it.

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