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- car traffic volume 3
- car traffic volumes 1
- car wheelsets 1
- car-building companies 2
- car-building enterprises 3
- car-building industry 1
- car-hour 1
- car-hours of idle time 1
- carbon air pollution 1
- carbon black 1
- carbon black concentration 2
- carbon conglomerate 1
- carbon deposits 1
- carbon dioxide 1
- carbon farming 1
- carbon footprint 1
- carbon nanoparticles 3
- carbon oxide conversion 1
- carbon pollution of the air 1
- carbonaceous 2