The company was labeled a polluter after inspectors found illegal waste dumping behind the plant.

The factory polluted the river last summer, killing many fish.

The once clear river became polluted after the factory expanded.

The factory's pollutive emissions have raised serious concerns among local residents.

The research team examined the pollutional effects of the new industrial complex on local waterways.

The lake became pollutable after the factory began discharging waste into it.

Scientists studying urban air quality found that nocturnal pollutions can have unexpectedly strong effects on respiratory health.

Scientists identified the industrial solvent as a dangerous air pollutant that had spread across the region.

Local water pollution from fertilizer runoff and factory discharge has killed large numbers of fish and made the river unsafe for swimming.

The light pollution from the downtown area made the Milky Way invisible to the naked eye.