According to the Environmental Protection Administration, last year 99 % of Taipei City's carbon monoxide, 66.3 % of hydrocarbons and 95 % of nitrides came from mobile pollution sources. This, in all, was almost 90 % of all air pollution.
環保署去年統計空氣汙染總量，台北市百分之九十九的一氧化碳、百分之六十六．三的碳氫化物和百分之九十五的氮氧化物來自移動汙染源，將近空氣汙染物排放總量的九成。