The lead pumped out in car exhausts, for example, goes straight into the atmosphere. Statistics show that 250,000 children suffer from lead poisoning each year in the United States alone, which produces varying conditions of damage to the central nervous system.
當四乙基鉛藉著汽車廢氣如潮湧進大氣，根據統計，美國每年有廿五萬個小孩因鉛中毒，造成輕重不一的神經中樞損傷。