Across
- 1. add water to gasses to help remove pollutants
- 2. precip that contains high amounts of acid
- 6. harmful substances that are added
- 8. build-up of toxic substances in a food web
- 9. measures how acidic or basic a substance is
- 10. remove dust from smokestacks
Down
- 1. a set of symptoms that may affect workers in a building
- 3. tiny and solid
- 4. lets gas through, but not solids
- 5. affects human health and the quality of life
- 7. one that is put directly into the air
- 11. no2 and co2