Which pollutant is the major target for controlling ground-level ozone formation?

Which pollutant is the major target for controlling ground-level ozone formation?

• A. Volatile Organic Compounds (VOCs)
• B. Nitrogen Dioxide (NO2)
• C. Carbon Monoxide (CO)
• D. Sulfur Dioxide (SO2)

Answer: (A)

Ground-level ozone forms when sunlight drives reactions between nitrogen oxides and volatile organic compounds, with the radicals produced from VOC oxidation fueling the chain that creates ozone. In many urban atmospheres, this chemistry is VOC-limited, meaning that reducing VOC emissions leads to bigger drops in ozone than reducing NOx alone. VOCs come from gasoline and diesel vapors, solvents, paints, and many industrial processes, and they’re often more straightforward to regulate quickly through fuel and product controls, vapor recovery, and handling practices. While NOx is also involved in ozone formation, and reducing NOx is still important, controlling VOC emissions is typically the most effective way to curb peak ground-level ozone in many settings. CO and SO2 aren’t the primary drivers of ozone formation—CO influences some radical chemistry but isn’t the main precursor, and SO2 forms sulfate particles rather than ozone.

Ground-level ozone forms when sunlight drives reactions between nitrogen oxides and volatile organic compounds, with the radicals produced from VOC oxidation fueling the chain that creates ozone. In many urban atmospheres, this chemistry is VOC-limited, meaning that reducing VOC emissions leads to bigger drops in ozone than reducing NOx alone. VOCs come from gasoline and diesel vapors, solvents, paints, and many industrial processes, and they’re often more straightforward to regulate quickly through fuel and product controls, vapor recovery, and handling practices. While NOx is also involved in ozone formation, and reducing NOx is still important, controlling VOC emissions is typically the most effective way to curb peak ground-level ozone in many settings. CO and SO2 aren’t the primary drivers of ozone formation—CO influences some radical chemistry but isn’t the main precursor, and SO2 forms sulfate particles rather than ozone.