Even if we remove all older, higher-polluting cars from the road, we will continue to breathe unhealthy air.

It also is downwind from several Midwestern power plants that state officials blame for much of the smog and unhealthy air.

At stake was the authority to define "unhealthy air" and, as a result, to shape public perceptions and expectations.

China's city dwellers to breathe unhealthy air 'for another 20-30 years'

"One hundred million people live in areas with unhealthy air," he said.

The fort is spread over several levels: on top is still visible the governor's house, never used because of the unhealthy air.

Try to consider having a healthy, viable community with unhealthy air and polluted waters.

However, Urban did not like the unhealthy air of the city, and on 5 September 1370 he sailed again to Avignon.

"Vast portions of our population are at risk of bad health or even death from unhealthy air," Edelman said at a news conference.

Not to your knowledge; but you have inhaled unhealthy air, and it has left its effect.