| Total requests for Jul 2009: 1,361 |
| Unique requests | Total requests | Query | Documents returned |
| 11 | 16 | PM2.5 | 3,994 |
| 10 | 11 | carbon dioxide | 71 |
| 8 | 8 | NAAQS | 87 |
| 7 | 11 | SO2 | 5,938 |
| 7 | 7 | nox | 12 |
| 6 | 9 | psd | 523 |
| 6 | 8 | Sulfuric acid H2SO4 | 0 |
| 6 | 6 | sulfur dioxide | 2 |
| 6 | 6 | co2 | 0 |
| 5 | 9 | greenhouse gases | 1 |
| 5 | 7 | Clean Air Act | 3 |
| 5 | 7 | 40cfr60 | 3,378 |
| 5 | 6 | sulfuric acid | 3 |
| 5 | 5 | wood stoves | 4 |
| 5 | 5 | voc | 2 |
| 5 | 5 | nitrogen oxide | 5 |
| 5 | 5 | major source | 20 |
| 4 | 11 | ozone depletion | 5,808 |
| 4 | 6 | CARBON MONOXIDE | 3 |
| 4 | 5 | lead | 75 |
| 4 | 4 | pellet stoves | 0 |
| 4 | 4 | particulate matter | 4 |
| 4 | 4 | ozone | 3 |
| 4 | 4 | nitrogen dioxide | 12 |
| 4 | 4 | cfc | 0 |
| 4 | 4 | NESHAPS | 860 |
| 3 | 5 | emission factors | 2 |
| 3 | 5 | air pollutants | 23 |
| 3 | 4 | tax credit | 17,269 |
| 3 | 4 | sulfur | 72 |
| 3 | 4 | emissions | 12 |
| 3 | 4 | Heavy METALS | 0 |
| 3 | 3 | water | 2 |
| 3 | 3 | sox | 0 |
| 3 | 3 | so2 emission | 1 |
| 3 | 3 | routine maintenance repair replacement | 1 |
| 3 | 3 | ract | 18 |
| 3 | 3 | pollutance | 14 |
| 3 | 3 | pellet | 1 |
| 3 | 3 | nsps | 1,065 |
| 3 | 3 | nonattainment | 3 |
| 3 | 3 | nonattainment areas | 3 |
| 3 | 3 | mold | 0 |
| 3 | 3 | laer | 1 |
| 3 | 3 | haps | 0 |
| 3 | 3 | dallas texas | 0 |
| 3 | 3 | criteria pollutants | 4 |
| 3 | 3 | cookstove | 0 |
| 3 | 3 | coal stoves | 0 |
| 3 | 3 | bact | 3,437 |
| 3 | 3 | asbestos | 299 |
| 3 | 3 | acid rain | 0 |
| 3 | 3 | MACT | 47 |
| 3 | 3 | 1500 rebate | 0 |
| 2 | 4 | land pollution | 0 |
| 2 | 3 | offsets | 0 |
| 2 | 3 | nitrous oxide | 1 |
| 2 | 3 | nitric oxide | 2 |
| 2 | 3 | naaqs sulfur dioxide | 6 |
| 2 | 3 | consent decree | 187 |
| 2 | 3 | area source | 0 |
| 2 | 3 | alaska | 1 |
| 2 | 2 | wood pellet | 1 |
| 2 | 2 | wood burning stoves | 3 |
| 2 | 2 | secondary pollution | 3 |
| 2 | 2 | rhode island | 1 |
| 2 | 2 | phosphorus | 4 |
| 2 | 2 | opacity | 0 |
| 2 | 2 | new source performance standards | 1 |
| 2 | 2 | n2o | 0 |
| 2 | 2 | monitoring | 9,093 |
| 2 | 2 | mercury | 2 |
| 2 | 2 | heatmor | 0 |
| 2 | 2 | fugitive dust | 0 |
| 2 | 2 | exempt | 3 |
| 2 | 2 | emission trend | 2 |
| 2 | 2 | emission standards | 24 |
| 2 | 2 | debottlenecking | 0 |
| 2 | 2 | crematories | 0 |
| 2 | 2 | class I | 1 |
| 2 | 2 | calculate emissions | 1 |
| 2 | 2 | benzene | 1 |
| 2 | 2 | air | 21 |
| 2 | 2 | air toxics | 3,929 |
| 2 | 2 | air quality | 15 |
| 2 | 2 | air permit | 32,398 |
| 2 | 2 | Title V | 0 |
| 2 | 2 | Prevention of Significant Deterioration | 0 |
| 2 | 2 | Green Procurement | 0 |
| 2 | 2 | BART guidelines | 0 |
| 2 | 2 | 40 CFR Part 745 | 0 |
| 1 | 10 | how is long term health effected | 16,892 |
| 1 | 5 | prompt | 14,519 |
| 1 | 4 | prompt reports | 18,148 |
| 1 | 4 | phase ii certified | 2 |
| 1 | 4 | midnight | 0 |
| 1 | 4 | carbon monoxid travel | 21,999 |
| 1 | 4 | 600SR-98017 | 18,428 |
| 1 | 3 | trends in national air pollutants | 26,220 |
| 1 | 3 | sulphur oxides | 0 |
| 1 | 3 | indoor stdandarts | 27,547 |