- American Lung Association
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- Climate Science Watch
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- DeSmogBlog
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- Environmental Integrity Project
- Environmental Working Group
- Natural Resources Defense Council
- National Wildlife Federation
- Northeast States for Coordinated Air Use Management
- Our Children's Earth
- Physicians for Social Responsibility
- Public Employees for Social Responsibility
- Sierra Club
- National Association of Clean Air Agencies
- Union of Concerned Scientists
- US Public Interest Research Group
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