In what way do motor vehicles harm the environment?
- By increasing radon levels.
- By decreasing radon levels.
- Correct answerBy increasing carbon monoxide levels.
- By decreasing carbon monoxide levels.
Explanation
Carbon monoxide is a poisonous gas emitted by vehicle exhausts into the atmosphere. Driving economically and keeping a vehicle well maintained can reduce the level of carbon monoxide emissions.
Read in Chinese
机动车辆以何种方式对环境造成危害？
- 通过增加氡含量。
- 通过降低氡水平。
- 通过增加一氧化碳浓度。
- 通过降低一氧化碳水平。
一氧化碳是车辆尾气排放到大气中的有毒气体。经济驾驶和保持车辆良好维护可以减少一氧化碳排放。