Which of the following is an air pollution reduction method?

• A. Venturi scrubbers
• B. Carburetor enrichment
• C. Biomonitoring
• D. Regulatory practices

Answer: (D)

Regulatory practices reduce air pollution by setting emission limits, requiring permits, and enforcing compliance. This approach changes behavior across many polluters, encouraging cleaner technologies, fuel shifts, and faster adoption of best practices, which lowers overall emissions across sectors. A venturi scrubber is a specific engineering device that removes pollutants from a gas stream at a particular source, so it’s a targeted control rather than a broad strategy. Biomonitoring plays a role in measuring pollution levels, not reducing them, and carburetor enrichment tends to increase emissions. So, policy-based regulatory measures provide a wide-reaching way to cut pollution across the entire system, making them the method that most effectively reduces air pollution overall.