Identifying Pollutant Adverse Effects Steps:

• Define adverse effect as a negative environmental or health impact from the pollutant.
• Examine each option for accurate pollutant-effect pairing.
• Eliminate options with beneficial effects or incorrect associations.
• Select the option linking a pollutant to a verified harmful outcome.

Why B is correct:

• Oxides of nitrogen (NOx) react with sunlight and hydrocarbons to form photochemical smog, a mixture containing carcinogens that increases cancer risk, per air quality regulations like the Clean Air Act.

Why the others are wrong:

• A: Carbon dioxide enhancing plant growth is a beneficial effect, not adverse.
• C: "Oxides of oxygen" is not a recognized pollutant; photochemical rain is not a defined adverse effect.
• D: Particulates contribute to air pollution but do not cause acid rain, which results from sulfur dioxide and NOx.

Final answer: B