And reducing buildingpollution is one important way for lowering outdoor airflow requirement, the higher indoor population density is, the greater energy conservation is.
同时，降低我国建筑污染水平是减少新风需求的重要途径，并且人员密度越高节能空间幅度越大。
2
Building more bypasses will help the environment by reducing pollution and traffic jams in towns and cities.
修建更多的支路将减少城镇中的污染和交通堵塞，从而改善环境。
《柯林斯英汉双解大词典》
3
They keep our air clean, reduce noise pollution, improve water quality and provide food and building materials.