Which of these is a secondary pollutant that is included in Air Quality Index (AQI) calculations?
Show answer & explanation
Correct answer: C
Explanation
Correct Answer: Ozone (O₃)
Explanation:
- • Secondary Pollutant: Ozone is not emitted directly from sources. It is formed through a chemical reaction occurring between oxides of nitrogen (NO₂) and volatile organic compounds (VOCs) in the presence of sunlight.
- • AQI Parameters: Ground-level ozone is one of the 8 key components of India's Air Quality Index (AQI).
Additional Facts:
- • Key AQI Pollutants: PM10, PM2.5, NO₂, SO₂, CO, O₃, NH₃, and Pb (Lead).
- • Excluded Gas: CO₂ (Carbon Dioxide) is not included in the calculation of the AQI.
- • Primary Pollutants: These are emitted directly from sources (such as vehicles or factories) (e.g., SO₂, CO).
Potential Questions for Upcoming Exams:
- • Question: How many pollutants are monitored under the AQI in India?
- Answer: 8 pollutants
- • Question: Which gas is not included in the AQI list but is a major contributor to global warming?
- Answer: Carbon Dioxide (CO₂)
- • Question: Which two elements must react in the presence of sunlight to form Ozone (O₃)?
- Answer: NOₓ and VOCs