三年前，莫拉莱斯出台禁令禁止进口排放浓烟的旧车以减少空气污染和缓解交通拥堵。
Three years ago Mr Morales banned imports of the oldest among these smoke-belching jalopies, to cut air pollution and traffic congestion.
公共交通系统可以减少污染和缓解交通负担。
Public transportation helps to cut down on pollution and traffic.
结果当地许多地方的空气污染状况最终得到了缓解，但排放到地球大气层的温室气体却在日益增加。
The result is that local air pollution is finally easing in many places but emissions of greenhouse gases into the planet's atmosphere are increasing.
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