Main air pollutant among the following is

Options

A. CO
B. `CO_(2)`
C. `N_(2)`
D. sulphur

Answer

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four options: Carbon Monoxide, Carbon Dioxide, Nitrogen, and Sulfur.

2. **Understand the Nature of Air Pollutants**: Air pollutants can be classified based on their sources and effects on health and the environment. Major air pollutants are typically those that have significant harmful effects on human health and the environment.

3. **Analyze Each Option**:
- **Carbon Monoxide (CO)**: This is a colorless, odorless gas produced primarily from the incomplete combustion of fossil fuels. It is known to be a major air pollutant due to its harmful effects on human health.
- **Carbon Dioxide (CO2)**: While it is a greenhouse gas and contributes to climate change, it is not classified as a major air pollutant in the same way as carbon monoxide.
- **Nitrogen**: This is a major component of the atmosphere and is generally not considered an air pollutant unless in specific compounds (like nitrogen oxides).
- **Sulfur**: Similar to nitrogen, sulfur is not a major air pollutant unless in specific forms (like sulfur dioxide), which can cause acid rain.

4. **Determine the Main Air Pollutant**: Based on the analysis, Carbon Monoxide is recognized as the main air pollutant among the options provided. It poses significant health risks by binding with hemoglobin in red blood cells, which reduces the blood's oxygen-carrying capacity.

5. **Conclude the Answer**: Therefore, the main air pollutant among the given options is **Carbon Monoxide**.