Minor pollutant in the following is

Options

A. Benzopyrene
B. Methane
C. Tetra ethyl lead
D. All

Answer

To determine the minor pollutants from the given options, we can follow these steps:

### Step 1: Understand the Definition of Pollutants
Pollutants are substances that cause pollution and can be categorized into major and minor pollutants. Major pollutants are those that have a significant impact on the environment, while minor pollutants have a lesser impact.

### Step 2: Identify the Major Pollutants
Common major pollutants include:
- Carbon Dioxide (CO2)
- Nitric Oxide (NO)
- Hydrogen Sulfide (H2S)
- Sulfur Dioxide (SO2)

### Step 3: Examine the Given Options
We need to analyze the options provided to identify which ones are considered minor pollutants. The options mentioned are:
1. Benzopyrene
2. Methane
3. Tetraethyl lead
4. All of the above

### Step 4: Classify Each Option
- **Benzopyrene**: This is a polycyclic aromatic hydrocarbon (PAH) that is considered a minor pollutant due to its lower concentration in the environment compared to major pollutants.
- **Methane**: Although it is a significant greenhouse gas, it is often classified as a minor pollutant in terms of direct air quality impact.
- **Tetraethyl lead**: This was used in gasoline and is considered a minor pollutant due to its reduced presence in the environment after the phase-out of leaded gasoline.

### Step 5: Conclusion
Since all the options listed (Benzopyrene, Methane, and Tetraethyl lead) are classified as minor pollutants, the correct answer is:
**Option 4: All of the above.**