Name any two sources which cause air pollution due to suspended particulate matter.

Explanation

**Step-by-Step Solution:**

1. **Understanding Suspended Particulate Matter (SPM):**
- Suspended particulate matter refers to tiny solid or liquid particles that are suspended in the air. These particles can be very small and are often not visible to the naked eye.

2. **Identifying Sources of Air Pollution:**
- To answer the question, we need to identify sources that release these suspended particles into the air, leading to air pollution.

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