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美国便携式林业机械有害废气排放简况美国环境保护部门对便携式林业机械排放的挥发性有机化合物（ＶＯＣ）、一氧化碳（ＣＯ）和氮氧化物（ＮＯｘ）的监测表明：１．便携式林业机械排放的上述三类废气量，分别占美国移动式机械排放上述废气量的０．８％、０．６％和０％。２．
Hazardous Exhaust Emissions from Portable Forestry Machinery in the United States Monitoring by the United States Environmental Protection Agency for volatile organic compounds (VOCs), carbon monoxide (CO) and nitrogen oxides (NOx) emitted by portable forestry machinery shows: The above three types of exhaust emissions from portable forestry machinery account for 0.8%, 0.6% and 0% of the above exhaust emissions from mobile machinery in the United States. 2.