Class I area

'Class I area' can also refer to...


More Like This

Show all results sharing this subject:

  • Environmental Science


Show Summary Details

Quick Reference

A geographical area designated by the US Clean Air Act where only a small amount of deterioration, or an increase in deterioration, of air quality is permitted. Examples include national parks, wilderness areas, monuments, and other areas of special national and cultural significance.

Subjects: Environmental Science.

Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.