Eliminate old cars, reduce pollution: Other exhaust gases, such as carbon monoxide, nitrogen oxide and sulfur dioxide, not only cause damage to the human body directly but are culprits in acid rain and the greenhouse effect, harming us indirectly as well.
淘汰舊車，減少汙染除了鉛以外，一氧化碳、氮氧化物、硫氧化物等其他廢氣，除對人體直接的傷害，也是酸雨、溫室效應的禍首；酸雨、溫室效應又間接回饋「傷害」到人身上來。