Yes, brake dust (from millions of cars, trucks, buses, and so on) is an environmental issue. Also tires: The tread of umpteen zillion tires is ground to dust every year, with that dust disappearing into the air, water, and land.
Meanwhile, a tiny increase in the amount of CO2 in the air lets every living plant breathe easier, and most of the actual exhaust pollutants were cut to near-zero years ago.
I remember what the air was like in SoCal back in the Seventies. It wasn't as bad as Beijing is now, but it was close.
Yes, brake dust (from millions of cars, trucks, buses, and so on) is an environmental issue. Also tires: The tread of umpteen zillion tires is ground to dust every year, with that dust disappearing into the air, water, and land.
Meanwhile, a tiny increase in the amount of CO2 in the air lets every living plant breathe easier, and most of the actual exhaust pollutants were cut to near-zero years ago.
I remember what the air was like in SoCal back in the Seventies. It wasn't as bad as Beijing is now, but it was close.