Across
- 4. created by EPA
- 7. causes cancer
- 9. federal law
- 12. keeps out radiation
- 13. interferes with health
Down
- 1. absorb infrared radiation
- 2. mineral fiber
- 3. pervasive air pollutants
- 5. trapped warm air
- 6. sulfur dioxide
- 8. synthetic chemicals
- 10. CH2O
- 11. naturally occurring gas