Name four tropospheric pollutants.

Explanation

**Step-by-Step Solution:**

1. **Understanding Tropospheric Pollutants**: The troposphere is the lowest layer of the Earth's atmosphere, where weather occurs and where many pollutants are found.

2. **Identifying Types of Pollutants**: Tropospheric pollutants can be classified into two main categories: gaseous pollutants and particulate matter.

3. **Listing Gaseous Pollutants**:
- One common gaseous pollutant is **sulfur dioxide (SO₂)**, which is primarily produced from industrial processes and the burning of fossil fuels.
...