| Disaster Planning/Emergencies | Disaster Planning/Emergencies | 54 |
| Environment/Superfund | Environment/Superfund | 44 |
| Energy/Nuclear | Energy/Nuclear | 29 |
| Waste (hazardous/solid/interstate/nuclear) | Waste (hazardous/solid/interstate/nuclear) | 27 |
| Natural Resources | Natural Resources | 21 |
| Telecommunications | Telecommunications | 13 |
| Consumer Issues/Safety/Products | Consumer Issues/Safety/Products | 11 |
| Clean Air and Water (quality) | Clean Air and Water (quality) | 7 |
| Education | Education | 6 |
| Homeland Security | Homeland Security | 6 |
| Defense | Defense | 5 |
| Transportation | Transportation | 3 |
| Railroads | Railroads | 3 |
| Budget/Appropriations | Budget/Appropriations | 3 |
| Manufacturing | Manufacturing | 2 |
| Trucking/Shipping | Trucking/Shipping | 2 |
| Fuel/Gas/Oil | Fuel/Gas/Oil | 2 |
| Communications/Broadcasting/Radio/TV | Communications/Broadcasting/Radio/TV | 2 |
| Roads/Highway | Roads/Highway | 2 |
| Utilities | Utilities | 1 |