Which pollutant is associated with photochemical smog formation?

Which pollutant is associated with photochemical smog formation?

• A. Ozone
• B. Nitrogen Oxides
• C. Mercury
• D. Particulate Matter

Answer: (B)

Photochemical smog forms when sunlight drives reactions between nitrogen oxides and volatile organic compounds released from vehicles and industry. The pollutant most closely associated with this smog is ozone, which is produced in the sunlit air when nitrogen dioxide is split by photons and the resulting oxygen atom quickly binds with molecular oxygen to form ozone. This ozone is the hallmark pollutant of photochemical smog and is linked to respiratory irritation and other health effects on sunny days. Nitrogen oxides serve as the precursors that fuel the ozone-formation chemistry, but they are not the smog pollutant itself in the same way. Mercury is unrelated to photochemical smog formation, and while particulate matter can accompany polluted air, it is not the defining product of this photochemical process.

Photochemical smog forms when sunlight drives reactions between nitrogen oxides and volatile organic compounds released from vehicles and industry. The pollutant most closely associated with this smog is ozone, which is produced in the sunlit air when nitrogen dioxide is split by photons and the resulting oxygen atom quickly binds with molecular oxygen to form ozone. This ozone is the hallmark pollutant of photochemical smog and is linked to respiratory irritation and other health effects on sunny days. Nitrogen oxides serve as the precursors that fuel the ozone-formation chemistry, but they are not the smog pollutant itself in the same way. Mercury is unrelated to photochemical smog formation, and while particulate matter can accompany polluted air, it is not the defining product of this photochemical process.