What are the natural sources of particulate matter?
Some natural sources of particulate matter include:
1. Wildfires: Smoke and ash generated by wildfires can release large amounts of particulate matter into the air.
2. Volcanic eruptions: Volcanic ash and other particulates released during volcanic eruptions can contribute to elevated levels of particulate matter in the atmosphere.
3. Dust storms: Dust storms can pick up and carry large amounts of particulate matter, particularly in arid regions.
4. Sea spray: Sea spray from breaking waves can release salt particles into the air, which can contribute to particulate matter levels in coastal areas.
5. Pollen: Pollen grains from trees, grasses, and other plants can also contribute to particulate matter in the air, particularly during pollen season.