Across
- 2. long-thins fibers that are valued for their strength and resistance to heat, but are dangerous when exposed to and can cause cuts and scares to the lungs
- 3. buildings that have very poor air quality
- 4. when harmful substances build up in the air to unhealthy levels
- 5. pollutant that forms when primary pollutants react with other primary pollutants or naturally occurring substances
- 7. pollutant that is put directly into the air by human activity
- 8. when the air above in warmer than the air below trapping pollutants near the Earth's surface
Down
- 1. units that the intensity of sound is measured in
- 2. rain, sleet, or snow that contains a high concentration of acids
- 5. when air pollution hangs over urban areas and reduces visibility
- 6. sudden influx of acidic water that causes a rapid change in the water's pH
- 9. measure of how acidic or basic a substance is