It has been such an important tool. For ordinary people, for the government, for everyone.

We’ve seen companies reduce their pollution because of this.

It’s so much better now.

Vehicle exhaust is truly one of our largest exposures. We decided that people were really not aware of the seriousness of the exposure.

That’s one of the easiest things you can do, and it doesn’t cost anything. We don’t think most people understand that vehicle exhaust components are carcinogenic. Too many people stand in back of their station...

The only hope is that people are learning. We want to see pesticides used like antibiotics. We cannot put the whole nation on antibiotics fearing that [people] will one day get sick.

What’s most staggering is that about 50 percent of the toxins in the air come from mobile sources.

One person comes in the morning and starts all the buses in a lot, and they idle until the drivers arrive. That can take an hour. These depots should never be in residential areas.