Which item was not part of the 1990 Clean Air Act Amendments?

Which item was not part of the 1990 Clean Air Act Amendments?

• A. Carbon dioxide
• B. Ozone depletion provisions
• C. Mercury emissions
• D. Acid rain provisions

Answer: (A)

The 1990 amendments were built around targeted pollutants and environmental issues with direct health and regional impact. They created a program to cut acid rain, mainly by reducing sulfur dioxide and nitrogen oxides from power plants, and they added provisions to protect the stratospheric ozone by phasing out ozone-depleting substances. They also expanded regulation of hazardous air pollutants, which includes pollutants like mercury and other toxic emissions from various industries, under tighter MACT standards. Carbon dioxide, as a greenhouse gas, was not addressed by these amendments, since climate-related regulation was not part of the 1990 Clean Air Act changes. That’s why carbon dioxide is the item that was not part of those amendments.

The 1990 amendments were built around targeted pollutants and environmental issues with direct health and regional impact. They created a program to cut acid rain, mainly by reducing sulfur dioxide and nitrogen oxides from power plants, and they added provisions to protect the stratospheric ozone by phasing out ozone-depleting substances. They also expanded regulation of hazardous air pollutants, which includes pollutants like mercury and other toxic emissions from various industries, under tighter MACT standards. Carbon dioxide, as a greenhouse gas, was not addressed by these amendments, since climate-related regulation was not part of the 1990 Clean Air Act changes. That’s why carbon dioxide is the item that was not part of those amendments.