Question 28 from UPSC CSE 2020 - ENVIRONME NT

Question

Which of the following are the reasons/factors for exposure to benzene pollution?
1. Automobile exhaust
2. Tobacco smoke
3. Wood burning
4. Using varnished wooden furniture
5. Using products made of polyurethane
Select the correct answer using the code given below:

IASCODEX · Accepted Answer

Correct Option: D. 1, 2, 3, 4, and 5

Strategy: Recognize and include all listed sources of benzene exposure, such as automobile exhaust, tobacco smoke, wood burning, and various household items containing varnish or polyurethane. This strategy prioritizes a comprehensive understanding due to benzene's ubiquitous presence across these diverse pathways.

Key Info: Benzene is an aromatic hydrocarbon found in the environment and used extensively in industry. Primary exposure routes in the population include:

- **Automobile exhaust**: A major contributor to ambient benzene, as benzene is added to petrol (gasoline) and released during combustion.
- **Tobacco smoke**: Both active and passive smoking significantly elevate benzene inhalation. Cigarette smoke is among the most concentrated sources of accessible benzene exposure for non-occupational individuals.
- **Wood burning**: Combustion of wood in fireplaces, stoves, or open fires emits benzene among other pollutants. Forest fires are a natural atmospheric source.
- **Varnished wooden furniture**: Many varnishes, wood finishes, adhesives, and paints contain or emit volatile organic compounds (VOCs) like benzene, xylenes, and trimethylbenzenes. Off-gassing from recently varnished items is a known indoor source.
- **Polyurethane products**: Polyurethane foams (in furniture, mattresses, etc.) can release benzene during manufacture, use, and especially when burned (e.g., in fire scenarios). Smoke from burning polyurethane is toxic, containing benzene along with other harmful gases such as toluene and hydrogen cyanide.

## Health Risks and Regulatory Context

Health risks from benzene exposure include acute symptoms (dizziness, headaches, drowsiness), chronic effects (bone marrow suppression, aplastic anemia), and a strong association with leukemia. Regulatory bodies such as the WHO and US EPA identify air pollution, household products, and occupational exposure as the most common sources globally.

IASCODEX · Answer

Option A: 1, 2, and 3 only

IASCODEX · Answer

Option B: 2 and 4 only

IASCODEX · Answer

Option C: 1, 3, and 4 only

Which of the following are the reasons/factors for exposure to benzene pollution? Automobile exhaust Tobacco smoke Wood burning Using varnished wooden furniture Using products made of polyurethane Select the correct answer using the code given below:

Which of the following are the reasons/factors for exposure to benzene pollution?

Automobile exhaust

Tobacco smoke

Wood burning

Using varnished wooden furniture

Using products made of polyurethane
Select the correct answer using the code given below: