This lead-freefuel requirement, in turn, significantly reduces the amount of lead (and other metal additives) in the atmosphere.
这种对无铅燃料的要求相应也显著地减少了大气中的铅含量(和其他金属附加物)。
2
Catalytic converters reduce carbon monoxide, oxides of nitrogen, and volatile organic compounds in emissions and necessitated the use of lead-freefuel.