SF should ditch dirty diesel muni buses & replace them w clean battery electric powered buses. Read all about it. sfexaminer.com/cities-lead-e…

getting more people out of their cars and onto Muni is better for air quality and climate change than worrying about the buses themselves.

when it comes to local air quality, you really do need to do something about buses.

Totally agree. Diesel buses and truck are about 4% of traffic in CA & about 25% of air pollution from vehicles.

when you say 4% of traffic do you mean 4% of registered vehicles or 4% of miles driven?

Worth noting that a huge amount of vehicle-created particulate matter comes from brakes and tires, not combustion. EVs don't help there.

see sciencedirect.com/science/ar…, 85% of particulates are non-exhaust emissions.

I prefer to not think of particulates from BART trains braking.

I recall seeing particularly bad things about PM2.5 and/or PM10 levels in some of the big RER stations (Auber, Châtelet).