Road Pollution

 Roads occupy less than 1% of the country yet 94% of Britain has some traffic pollution above background levels. 

The most widespread pollutants are tiny particles, mostly from fossil fuel burning, nitrogen dioxide from diesel vehicles, and noise and light. More than 70% of the country is affected by all of these, with the only land to escape road pollution being almost entirely at high altitudes.

Road pollution affects 94% of Britain, study finds | Pollution | The Guardian