发动机排气污染 meaning in Chinese

engine pollution

Test procedure for the measurement of exhaust emissions from small utility engines
小型多用途发动机排气污染的测量试验程序
The development and study of the engine electronic control technology , which is regarded as one important method to reduce the exhaust emissions and improve the power and economy performance , is paid more and more attention
发动机电控技术作为降低发动机排气污染，提高其动力性和经济性的一个重要手段，它的研究和开发越来越受到人们的重视。