"Improving environmental quality and building a beautiful Huaibei" is our common responsibility. With the rapid development of our city, smog weather has also appeared in our city. The following conditions: ①

Sulfur dioxide mainly comes from the combustion of coal, oil and other fuels, as well as the waste gas emitted by factories. Carbon monoxide mainly comes from incomplete combustion of fossil fuels and automobile exhaust. So 124 will cause air pollution. Carbon dioxide exhaled by animals and plants belongs to the air and does not pollute the air.

Therefore, choose: d.