| Total requests for Jun 2009: 1,290 |
| Unique requests | Total requests | Query | Documents returned |
| 35 | 37 | naaqs | 65,891 |
| 32 | 45 | NAAQS Tables | 9,755 |
| 7 | 12 | boiler mact | 7,352 |
| 7 | 9 | AP-42 | 1,464 |
| 6 | 19 | nsps | 10,138 |
| 5 | 6 | attainment | 5,772 |
| 5 | 5 | VOC | 55,210 |
| 4 | 5 | national ambient air quality standards | 23,340 |
| 4 | 5 | gina mccarthy | 13 |
| 4 | 5 | clean air act | 17,114 |
| 3 | 23 | ctg | 850 |
| 3 | 9 | air pollution | 21,365 |
| 3 | 5 | training | 4,837 |
| 3 | 5 | 40cfr60 | 3,668 |
| 3 | 4 | emission factors | 9,585 |
| 3 | 3 | regina McCarthy | 2 |
| 3 | 3 | permits | 7,047 |
| 3 | 3 | lead | 15,760 |
| 3 | 3 | green book | 1,721 |
| 3 | 3 | cancer | 2,579 |
| 3 | 3 | PM10 | 22,889 |
| 3 | 3 | AFS | 789 |
| 2 | 4 | north carolina | 21,462 |
| 2 | 4 | NESHAP | 20,848 |
| 2 | 3 | subpart KKK | 14 |
| 2 | 3 | risk management plan | 2,980 |
| 2 | 3 | planar solid oxide fuel cells | 2,344 |
| 2 | 3 | modelling | 5,851 |
| 2 | 3 | maps | 11,399 |
| 2 | 3 | landfill | 29,274 |
| 2 | 3 | docket 573 | 2,232 |
| 2 | 3 | air toxics | 8,363 |
| 2 | 3 | acid rain | 2,928 |
| 2 | 3 | Title V | 6,958 |
| 2 | 3 | TRI | 2,856 |
| 2 | 3 | Federally Reportable Violation Guidance | 492 |
| 2 | 3 | Carbon Monoxide | 6,077 |
| 2 | 3 | Air Quality Conditions | 15,467 |
| 2 | 3 | 600 Neighborhoods | 208 |
| 2 | 2 | streamlining | 1,584 |
| 2 | 2 | standards | 26,635 |
| 2 | 2 | nsr | 1,746 |
| 2 | 2 | nata | 555 |
| 2 | 2 | greenbook | 95 |
| 2 | 2 | enforcement | 7,765 |
| 2 | 2 | dispersion modelling | 1,848 |
| 2 | 2 | dioxin | 1,332 |
| 2 | 2 | carbon dioxide | 244 |
| 2 | 2 | attainment areas | 7,543 |
| 2 | 2 | air data | 18,060 |
| 2 | 2 | Vinyl Chloride EDC | 3 |
| 2 | 2 | Region VII | 1,593 |
| 2 | 2 | Radon | 1,081 |
| 2 | 2 | MACT hammer | 92 |
| 2 | 2 | Freon | 214 |
| 2 | 2 | CEMS | 10,637 |
| 2 | 2 | CAIR | 710 |
| 1 | 27 | alaska | 4,161 |
| 1 | 25 | incorporation by reference | 1,227 |
| 1 | 13 | Sampling analytical methods | 6,247 |
| 1 | 12 | prescribed fire | 10,146 |
| 1 | 10 | prescribed fire guidance document | 1,575 |
| 1 | 9 | Consent decree guidance | 10,511 |
| 1 | 8 | single source determination | 16,550 |
| 1 | 8 | department of defense | 152 |
| 1 | 7 | ozone depleting substances | 11,669 |
| 1 | 7 | leak detection repair | 11,901 |
| 1 | 7 | iowa | 3,208 |
| 1 | 7 | draft for epa science advisory board review | 796 |
| 1 | 7 | auto shredder | 115 |
| 1 | 7 | BACT | 29,250 |
| 1 | 6 | voc paint exempt solvents | 13,265 |
| 1 | 6 | Estimates of Methane Emissions from the U.S. Oil Industry | 13,756 |
| 1 | 6 | Biofilters | 125 |
| 1 | 5 | repowering definition | 15,937 |
| 1 | 5 | naaqs attainment | 16,903 |
| 1 | 5 | kmz | 17,451 |
| 1 | 5 | guidelines for national security exemptions | 28 |
| 1 | 5 | civil penalty policy | 16,145 |
| 1 | 5 | Illinois vehicle emissions inspection law | 114 |
| 1 | 5 | Aermod airport | 16,505 |
| 1 | 4 | title V contacts | 1,321 |
| 1 | 4 | synergistic | 162 |
| 1 | 4 | sulfate | 22,233 |
| 1 | 4 | streamlining White Paper #2 | 345 |
| 1 | 4 | promet | 2,294 |
| 1 | 4 | oeca | 20,059 |
| 1 | 4 | nsps applicability determination pollutant specific | 20,546 |
| 1 | 4 | miami | 25,172 |
| 1 | 4 | interactive lessons on radiation | 238 |
| 1 | 4 | continuous emission monitoring systems | 974 |
| 1 | 4 | asthma | 1,444 |
| 1 | 4 | applicability determination index | 21,044 |
| 1 | 4 | NAAQS areas | 5,089 |
| 1 | 4 | EGAS | 97 |
| 1 | 3 | white paper #2 | 5,777 |
| 1 | 3 | voc paint methods | 109 |
| 1 | 3 | voc list | 2,340 |
| 1 | 3 | traject | 6 |
| 1 | 3 | technology | 9,244 |
| 1 | 3 | styrene | 516 |
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