Smoke is a primary pollutant.

Answer

**Step-by-Step Solution:**

1. **Understanding Pollutants**: Begin by defining what pollutants are. Pollutants are substances that contaminate the environment and can cause harm to living organisms and the ecosystem.

2. **Types of Pollutants**: Distinguish between primary and secondary pollutants.
- **Primary Pollutants**: These are pollutants that are emitted directly into the atmosphere from a source. Examples include smoke, carbon monoxide, and sulfur dioxide.
- **Secondary Pollutants**: These are not emitted directly. Instead, they form in the atmosphere through chemical reactions between primary pollutants and other components in the air. An example of a secondary pollutant is acid rain.

3. **Identifying Smoke**: Recognize that smoke is produced from the combustion of organic materials, such as wood, coal, or fossil fuels. When these materials burn, they release smoke directly into the atmosphere.

4. **Conclusion**: Since smoke is released directly into the air during combustion, it fits the definition of a primary pollutant. Therefore, the statement "Smoke is a primary pollutant" is true.

**Final Answer**: Yes, smoke is a primary pollutant.

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