Environmental

4. that serves as a measure of the environmental conditions that exist in a given locale
8. occurs when runoff from rain and snowmelt carries pollutants into waterways such as rivers, streams, lakes, wetlands, and even groundwater
10. forms a protective barrier that prevents ultraviolet sunlight radiation from the sun from reaching the Earth's surface

1. gases that are emitted into the air from products or processes
2. any single identifiable source of pollution from which pollutants are discharged
3. the rise or increase in the contaminated substances caused by the intoxicating environment
5. a family of poisonous, highly reactive gases
6. forms when primary pollutants react in the atmosphere
7. an air pollutant emitted directly from a source
9. air pollution that reduces visibility