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Buildings
Flat
Germany
steam, Chimney, pollution
Black
512x512
Nature
Industry
Co2, nature, pollution
Ecologicons
buildings, industry, Building
Signs
earth, pollution, worldwide
forbidden, pollution, graffiti
shapes
petroleum, petrol, shapes
Transport
Mechanicons
transport, pollution, Car
iOS7 Set Lined 2
city, Contamination, industry
Industrial, industry, Factories
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Family & home
Pixel
IconBeast Lite
pollution, Factory
30x30