Which of the following is NOT a criteria pollutant?Question 6Select one:a.carbon monoxideb.volatile organic compoundsc.sulfur dioxided.ozone

Sure, let's go through the options step by step to determine which one is NOT a criteria pollutant.

1. Carbon Monoxide (CO):

   • Carbon monoxide is a colorless, odorless gas that is produced by burning fossil fuels. It is indeed a criteria pollutant as defined by the Environmental Protection Agency (EPA).

2. Volatile Organic Compounds (VOCs):

   • Volatile organic compounds are a group of chemicals that easily become vapors or gases. While they are significant pollutants and contribute to the formation of ozone, they are not listed as one of the six criteria pollutants by the EPA.

3. Sulfur Dioxide (SO₂):

   • Sulfur dioxide is a gas produced by volcanic eruptions and industrial processes, particularly the burning of coal and oil at power plants and refineries. It is a criteria pollutant.

4. Ozone (O₃):

   • Ozone at ground level is a harmful air pollutant and a major component of smog. It is also listed as a criteria pollutant by the EPA.

Based on the above information, the correct answer is:

b. volatile organic compounds