Among the following which one causes more indoor chemical pollution ?

Options

A. Burning coal
B. Burning cooking gas
C. Burning mosquito coil
D. Room spray

Answer

To determine which option causes more indoor chemical pollution, we need to analyze the potential pollutants released by each option provided.

### Step-by-Step Solution:

1. **Understand Chemical Pollution**:
- Chemical pollution occurs when harmful chemicals from human activities enter the environment, contaminating air, water, or soil.

2. **Evaluate Each Option**:
- **Burning of Cooking Gas**: This typically produces carbon dioxide and water vapor, which are not considered harmful pollutants in normal usage.
- **Room Spray**: While it may contain chemicals, the concentration and volume used indoors are generally low and do not significantly contribute to indoor air pollution.
- **Burning of Coal**: This process releases a variety of harmful pollutants, including carbon monoxide (CO), sulfur oxides (SOx), nitrogen oxides (NOx), and particulate matter, which can severely affect indoor air quality.
- **Burning of Mosquito Coil**: While mosquito coils do release some pollutants, primarily pyrethroids like pyrethrum C, the overall impact is less severe compared to coal burning.

3. **Identify the Most Harmful Option**:
- Among the options evaluated, burning coal releases a wide range of harmful pollutants that can lead to serious health issues, including respiratory disorders and even death in extreme cases.

4. **Conclusion**:
- Therefore, the option that causes more indoor chemical pollution is **burning of coal**.

### Final Answer:
The correct answer is **burning of coal**.