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- Motors
- Automobiles 16
- Exhaust gas 15
- Environmental aspects 8
- Motor vehicles 7
- Airplanes 6
- Government policy 4
- Pollution control devices 4
- Standards 4
- Air quality management 3
- Design and construction 3
- Law and legislation 3
- Technological innovations 3
- Combustion 2
- Control systems 2
- Cost effectiveness 2
- Evaluation 2
- Fuel consumption 2
- Fuel systems 2
- History 2
- Motor fuels 2
- Toxicology 2
- Transportation 2
- Acoustic properties 1
- Air 1
- Air ducts 1
- Air quality 1
- Aircraft gas-turbines 1
- Airframes 1
- Carbon dioxide mitigation 1
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