They make a constant din and cause acutepollution.
这些摩托车喧嚣不断，还会造成严重污染。
2
If these targets were to be achieved, significant reductions in risks for acute and chronic health effects from air pollution can be expected.
如果能够实现这些目标，可望大量减少空气污染对健康带来的急性和慢性影响。
3
Indoor air pollution associated with the still-widespread use of biomass fuels kills nearly one million children annually, mostly as a result of acute respiratory infections.