APES Unit 7 Crossword

2. Formed from reactions of primary pollutants in the atmosphere (e.g., O₃, nitric acid).
4. Group of air pollutants (NO and NO₂) formed during combustion; leads to smog and acid rain.
6. Tiny solid or liquid particles in air; can cause respiratory problems.
8. – Harmful or annoying levels of noise from human activity.
11. – Grows in damp areas; causes respiratory distress.
17. – Vehicle efficiency standards to reduce fuel use and pollution.
20. Air pollution from VOCs and NOx reacting with sunlight to form ozone and oxidants.
22. – VOC in furniture and glues; respiratory irritant.
24. – US law that regulates air pollutants; sets standards for emissions.
25. – Biological stress response triggered by noise.
27. Urban areas are warmer due to low albedo and less evapotranspiration.
28. – Radioactive gas from uranium in soil; second leading cause of lung cancer.
29. Atmospheric condition where a layer of warm air traps cooler air and pollutants near the ground.

1. – Insulation material; hazardous when airborne; causes lung disease.
3. Evaporative compounds from gas, paint, trees; precursors to ozone.
5. – Removes PM by charging particles and collecting them on plates.
7. Paint – Older homes may contain lead; causes neurodevelopmental damage.
9. Forms from NOx and VOCs with sunlight; major component of smog.
10. – Reduces NOx and CO in car emissions.
12. – Devices that remove pollutants (SOx, NOx, PM) from exhaust streams.
13. Incomplete combustion product; binds to hemoglobin and reduces oxygen transport.
14. Emitted directly from a source (e.g., NOx, SO₂, CO).
15. Forms from NOx reacting with water and oxygen.
16. – Fabric filter that captures particulates from air streams.
18. Forms when SO₂ reacts with water and oxygen.
19. – Tradable permits for emissions; incentivize pollution reduction.
21. Toxic heavy metal; previously in gasoline and paint; neurotoxin.
23. Air pollutant from coal combustion; causes respiratory irritation and acid rain.
26. Used to neutralize acidic soils and waters.