| Total requests for Jul 2007: 719 |
| Unique requests | Total requests | Query | Documents returned |
| 4 | 11 | AP-42 | 1,475 |
| 4 | 5 | emc books | 31 |
| 3 | 6 | improving transportation data for mobile source emission estimates | 3,039 |
| 3 | 3 | method 5 | 4,436 |
| 2 | 5 | Grey water | 308 |
| 2 | 5 | 40 CFR 68 | 1,149 |
| 2 | 4 | air pollution | 62,655 |
| 2 | 3 | TO-1 | 2,512 |
| 2 | 3 | MACT | 9,949 |
| 2 | 2 | Tank 4.0 Software | 348 |
| 2 | 2 | section 721.110 | 78 |
| 2 | 2 | new source performance standards | 6,465 |
| 2 | 2 | modification | 6,262 |
| 2 | 2 | caircamrcavr | 55 |
| 2 | 2 | 40 CFR Part 64 | 4,605 |
| 1 | 16 | ncore | 2,908 |
| 1 | 11 | boiler nox | 39,608 |
| 1 | 8 | RACT NOx | 1,564 |
| 1 | 8 | proposed regulations | 12,441 |
| 1 | 7 | Used Oil Regulations - MN | 3,785 |
| 1 | 7 | synthetic minor | 1,126 |
| 1 | 7 | mobile user guide | 542 |
| 1 | 7 | fabric filter emissions estimates | 1,214 |
| 1 | 6 | mold | 3,063 |
| 1 | 6 | coal ash uranium concentration | 54 |
| 1 | 5 | vehicle deteriorate | 1,631 |
| 1 | 5 | Hashimoto | 293 |
| 1 | 5 | emergency generators | 3,166 |
| 1 | 5 | carbon absorbers bulk terminals | 472 |
| 1 | 5 | carbon absorbers | 2,093 |
| 1 | 5 | Acetaldehyde standard | 1,129 |
| 1 | 4 | wastewater treatment plant | 2,036 |
| 1 | 4 | tsp attainment indiana | 86 |
| 1 | 4 | Subpart Kb | 286 |
| 1 | 4 | release reporting | 111 |
| 1 | 4 | particle suspended load | 677 |
| 1 | 4 | odor method | 718 |
| 1 | 4 | NSPS subpart Dc | 1,995 |
| 1 | 4 | nonattainment zone Michigan | 1,025 |
| 1 | 4 | modeldinances | 1,247 |
| 1 | 4 | emission control | 90,592 |
| 1 | 4 | cost analysis | 0 |
| 1 | 4 | civil penalty policy Appendix 6 | 225 |
| 1 | 4 | CEMS database export | 138 |
| 1 | 4 | Boilers MACT | 10,105 |
| 1 | 4 | boiler nox treatment | 1,385 |
| 1 | 3 | waste sump | 9,201 |
| 1 | 3 | true minor | 4,261 |
| 1 | 3 | SNAP LISTS INDEX | 93 |
| 1 | 3 | silica | 813 |
| 1 | 3 | rti2000 | 126 |
| 1 | 3 | robert myers | 148 |
| 1 | 3 | risk screening guidance document | 1,284 |
| 1 | 3 | psd permit guidance document | 1,437 |
| 1 | 3 | psd permit guidance | 1,542 |
| 1 | 3 | PSD Increment | 284 |
| 1 | 3 | Protocol for Equipment Leak Emission Estimates | 7,898 |
| 1 | 3 | part 62 approved plans | 168 |
| 1 | 3 | PAL | 11,276 |
| 1 | 3 | oxidation catalyst | 2,237 |
| 1 | 3 | odor emission | 1,188 |
| 1 | 3 | nsps determinations | 1,337 |
| 1 | 3 | new source permitting | 315 |
| 1 | 3 | naaqs nonattainment | 42,988 |
| 1 | 3 | mobile1 | 3,693 |
| 1 | 3 | methods for measuring fugitive PM10 emission rates | 11,838 |
| 1 | 3 | Guidance Manual | 2,677 |
| 1 | 3 | fugitive emissions | 8,080 |
| 1 | 3 | emission fees | 2,994 |
| 1 | 3 | consumer products | 10,212 |
| 1 | 3 | cohpac | 30 |
| 1 | 3 | cems data | 9,586 |
| 1 | 3 | cavr | 41 |
| 1 | 3 | cair camr cavr | 82 |
| 1 | 3 | AP-42 combustion | 1,100 |
| 1 | 3 | annual pm10 naaqs | 41,407 |
| 1 | 3 | air monitoring design review | 7,173 |
| 1 | 3 | 608 certification r134a | 1,368 |
| 1 | 2 | welding | 940 |
| 1 | 2 | vehicle mobile temperature emission factor | 1,278 |
| 1 | 2 | vacate mact | 143 |
| 1 | 2 | uranium concentration | 434 |
| 1 | 2 | UEPA particle suspended load | 11,144 |
| 1 | 2 | tyre burning | 19 |
| 1 | 2 | tier 2 | 2,585 |
| 1 | 2 | tank refloat | 16 |
| 1 | 2 | Stage II vapor reco systems options paper 2006 | 253 |
| 1 | 2 | safley 1992 | 23 |
| 1 | 2 | responsible person | 6,576 |
| 1 | 2 | refloat tank continuous | 194 |
| 1 | 2 | PTE fuel | 282 |
| 1 | 2 | PSD definition | 914 |
| 1 | 2 | power plant emissions CEMS database export | 21 |
| 1 | 2 | PM10 monitoring fugitive emissions | 559 |
| 1 | 2 | Plain English Guide | 204 |
| 1 | 2 | paint fumes | 392 |
| 1 | 2 | organizational chart | 225 |
| 1 | 2 | operational design limitations | 5,018 |
| 1 | 2 | odor | 1,048 |
| 1 | 2 | NSPS petroleum refineries | 352 |
| 1 | 2 | nsps eeeee | 1,130 |
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