| U.S. General Accounting Office |
| Survey of State and Local Air Pollution Control Officials (GAO-04-337SP) |
| Q13_3. In your professional judgment, prior to the December 31, 2002 revisions, what were the two most significant problems posed by the PSD/NSR program for meeting air quality standards?: Air quality modeling |
| Not checked | Checked | No Answer | Number of respondents |
| 39 | 5 | 0 | 44 |