1 raise prices make people especially low-income families, reduce the consumption of gasoline, urban development of public transport system, thereby reducing the private car exhaust emission, reduce air pollution

2 make car manufacturers to invention using renewable and clean energy, thus reduce automobile air pollution

3 raise prices may not be able to stop people use gasoline, because the car in many countries is necessary means of transportation. At the same time, increase in oil prices could market turmoil.

这样的可以吗

SCR是Selective（选择性）、Catalytic（催化）、Reduction（还原）的英文缩写，全称为“选择性催化还原”技术，是柴油机尾气处理的一种方式。目前采用的还原剂是尿素（就是肥料，不过这里用的要比农用的纯度要高的多），尿素加水后在高温下分解为NH3和CO2，与柴油车尾气中的No和NO2通过化学反应，产生氮气和水。降低柴油车尾气中的NO和NO2排放，当然实际车辆使用还要增加其它设备。

柴油车要达到欧4或国4排放标准，目前必须的有这套系统