I spend a year at the Hoover Institute at Stanford, researching market approaches to air pollution control.

Love is in the air but the air is highly polluted

The health effects of air pollution imperil human lives. This fact is well-documented.

Carpooling is important for urban density, air pollution and other reasons, but carpooling is not the kind of thing that actually changes the energy equation.

I think the commissioners could deny a [new] subdivision, if it put them in violation of the air-pollution control limit.

It isn't pollution that's harming the environment. It's the impurities in our air and water that are doing it.