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1989年布什总统提出,由于严重的臭氧问题,可在一些城市使用可供选择的汽油代用品,颁布了一项以甲醇代替汽油的命令。由此对甲醇汽车减少排放物的效益和燃料费用引起了争议。由《未来资源》(RFF)指导的一项新近完成的研究提出,使用甲醇汽车司能比减少臭氧的某些其它对策花费要少一些。美国很多城市不能达到国家环境大气质量标准,促使制定政策的人对某些污染物制定新的史为严格的管理。其中之一是城市烟雾中的主要成份臭氧,它是一种特别难控制的污染物,因为它不是排放出来的,而是在大气中由活性碳氢化合物(或挥发性有机化合物VOCs)与氮氧化物NOx在阳光下混合而形成的。作为VOCs和NOx的主要来源—城市地区VOCs排放约占40％,NOx排放约占
In 1989, President Bush proposed that alternative gasoline substitutes be available in some cities due to the serious ozone problem and that an order to substitute methanol for gasoline be enacted. This has caused controversy over the benefits and fuel costs of methanol vehicles in reducing emissions. A recently completed study, led by RFF, suggested that using methanol cars would cost less than some other measures to reduce ozone. Many cities in the United States fail to meet the national ambient air quality standards, prompting those who formulate policies to formulate new histories of certain pollutants. One of these is ozone, a major component of urban smog, a particularly unmanageable pollutant because it is not emitted but consists of activated hydrocarbons (or volatile organic compounds) and nitrogen Oxides NOx are formed by mixing in the sun. As the main source of VOCs and NOx - VOCs emissions in urban areas account for about 40%, and NOx emissions account for about