Why is it advised that automobiles should switch over to clearner fuels, like CNG and LPG ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Problem**: The question asks why it is recommended for automobiles to switch to cleaner fuels such as CNG (Compressed Natural Gas) and LPG (Liquefied Petroleum Gas).

2. **Identify the Issues with Current Fuels**: Traditional fuels like petrol and diesel contribute significantly to air pollution. They release harmful substances into the atmosphere when burned.

3. **Pollution Increase**: The use of conventional fuels leads to an increase in pollution levels. As more automobiles are used, the amount of harmful emissions also rises, which can have detrimental effects on the environment.

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