采用如低起燃温度催化剂、密耦催化剂、HC捕集器、二次空气注入和电加热催化剂等在内的排气后处理技术，可以有效地减少污染物尤其是HC的排放。
It may effectively reduce the HC emissions to use a catalyst with low light-off temperature, close-coupled catalyst, HC traps, second air injection and electrically heated catalyst.
发动机在冷起动阶段由于空气温度低、燃油雾化不好、催化剂未能达到起燃温度，因而hc和CO污染严重。
In the cold starting phase, because of the lower air temperature, the worse fuel atomization, and the catalyst temperature being below initiation temperature, HC and co emissions are high.
发动机在冷起动阶段由于空气温度低、燃油雾化不好、催化剂未能达到起燃温度，因而hc和CO污染严重。
In the cold starting phase, because of the lower air temperature, the worse fuel atomization, and the catalyst temperature being below initiation temperature, HC and co emissions are high.
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