1.   The city was already polluted from a long history of steel and heavy manufacturing.

2.   This creates a public nuisance in Chicago comparable to a suburban industry polluting the city with poison gas, he said.

3.   The Soviet government paid little attention to environmental protection, developing industrial giants which polluted cities and mercilessly destroyed nature.

4.   Their city is polluted, congested, and the rarity of its parking spaces is matched only by the rarity of its parks.