Choose the incorrect statement.

Options

A. (a) The Montreal protocol is associated with the control of emission of ozone depleting substances
B. (b) Methane and carbon dioxide are green house gases
C. (c) Dobson units are used to measure oxygen content
D. (d) Use of incinerators is crucial to disposal of hospital wastes

Answer

To solve the question "Choose the incorrect statement," we will analyze each option provided and determine which one is false.

### Step-by-Step Solution:

1. **Analyze Option A**:
- Statement: "Montreal Protocol is asserted with the control of emission of ozone-depleting substances."
- Evaluation: This statement is true. The Montreal Protocol was established to phase out substances that deplete the ozone layer, including chlorofluorocarbons (CFCs).

2. **Analyze Option B**:
- Statement: "Methane and carbon dioxide are greenhouse gases."
- Evaluation: This statement is true. Both methane (CH₄) and carbon dioxide (CO₂) are recognized as greenhouse gases that contribute to global warming by trapping heat in the atmosphere.

3. **Analyze Option C**:
- Statement: "Dobson units are used to measure oxygen content."
- Evaluation: This statement is false. Dobson units are actually used to measure the concentration or thickness of the ozone layer, not oxygen content.

4. **Analyze Option D**:
- Statement: "Use of incinerators is crucial to the disposal of hospital waste."
- Evaluation: This statement is true. Incinerators are commonly used to safely dispose of hospital waste through thermal decomposition, which involves burning the waste at high temperatures.

5. **Conclusion**:
- After evaluating all the options, we find that Option C is the incorrect statement.

### Final Answer:
The incorrect statement is **C**: "Dobson units are used to measure oxygen content."

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