Across
- 1. Brown-air smog created by sunlight + pollutants
- 3. Day-to-day changes in atmospheric conditions
- 6. Warm air traps cooler air near the surface
- 9. Layer above the troposphere containing the ozone layer
- 11. Protective layer that absorbs UV radiation
- 14. Acid formed when sulfur dioxide reacts in the atmosphere
- 17. Volatile organic compounds that easily evaporate
- 18. Long-term weather patterns
- 19. Pollution inside buildings
- 20. Irritating secondary pollutant formed from VOCs + NOx
- 22. Acidic particles or droplets falling to Earth
Down
- 2. U.S. law that regulates air pollution
- 4. Lowest layer of the atmosphere where weather happens
- 5. Pollutants released directly from a source
- 7. Gas released from burning sulfur-containing fuels
- 8. Pollutants formed by chemical reactions in the air
- 10. The layer of gases surrounding Earth
- 12. Radioactive indoor gas from soil
- 13. Acid formed from nitrogen oxides
- 15. Harmful substances in the air
- 16. Gray-air smog from burning coal
- 21. Tiny solid or liquid particles in the air