Question

Which category best describes substances that occur naturally but cause pollution when concentration increases?

• A. Qualitative pollutants
• B. Non-biodegradable pollutants
• C. Quantitative pollutants
• D. Secondary pollutants

Answer 1

Answer:

C. Quantitative pollutants

• Correct Answer: Option C - Quantitative pollutants

• Quantitative pollutants are substances that occur naturally in the environment but become pollutants when their concentration increases beyond normal levels. These substances are not inherently harmful at natural concentrations but become problematic when their quantities exceed certain thresholds.

• Examples of quantitative pollutants include:

• Carbon dioxide (CO2) - It's a natural component of the atmosphere, but excessive amounts from burning fossil fuels contribute to global warming

• Nitrogen oxides - Present naturally in small amounts but become harmful when concentrations increase from vehicle emissions and industrial processes

• Methane - A natural gas produced by decomposition but becomes a potent greenhouse gas when released in large quantities

• Ozone - Beneficial in the upper atmosphere but harmful as a ground-level pollutant when concentrations increase

• Qualitative pollutants: Substances that are harmful in any amount

• Non-biodegradable pollutants: Substances that cannot be broken down by natural processes

• Secondary pollutants: Substances formed when primary pollutants react in the atmosphere