| Total requests for Feb 2012: 2,431 |
| Unique requests | Total requests | Query | Documents returned |
| 35 | 42 | r11 | 11,178 |
| 23 | 24 | cfc | 288 |
| 13 | 19 | 134a | 15,497 |
| 13 | 15 | 609 certification | 5,691 |
| 11 | 23 | permited releases | 15,779 |
| 11 | 12 | 608 test | 1,023 |
| 11 | 11 | HCFC | 222 |
| 10 | 11 | 609 | 8,355 |
| 10 | 10 | 608 | 142 |
| 8 | 11 | ozone depletion | 8,674 |
| 8 | 10 | refrigerants | 539 |
| 8 | 8 | gwp | 168 |
| 8 | 8 | Section 608 | 97 |
| 8 | 8 | Freon | 18 |
| 7 | 13 | r-134a | 20,236 |
| 7 | 12 | HFC | 9,174 |
| 7 | 8 | r-410a | 59 |
| 7 | 7 | halon | 130 |
| 6 | 8 | R134A | 13,159 |
| 5 | 7 | universal 608 | 13,682 |
| 5 | 6 | 407c | 35 |
| 5 | 5 | montreal protocol | 248 |
| 5 | 5 | R404a | 2 |
| 5 | 5 | 609 fines | 153 |
| 4 | 7 | r410a | 13,082 |
| 4 | 6 | r classification for h3 | 16,299 |
| 4 | 5 | EPA Certification Test | 18,341 |
| 4 | 4 | odp | 140 |
| 4 | 4 | microwave | 4 |
| 4 | 4 | STUdy guide | 22,385 |
| 3 | 7 | 40cfr | 26,866 |
| 3 | 6 | deminimus | 31,699 |
| 3 | 6 | climate change | 50,497 |
| 3 | 5 | polystyrene | 18,010 |
| 3 | 5 | ozone hole | 25,918 |
| 3 | 5 | de minimus | 19 |
| 3 | 5 | carbon dioxide | 1,010 |
| 3 | 5 | Trace gas | 67 |
| 3 | 4 | south africa | 14 |
| 3 | 4 | refrigerant certification | 22,461 |
| 3 | 4 | practice test | 46,806 |
| 3 | 4 | forms | 21,952 |
| 3 | 4 | Hydrocarbon | 26,346 |
| 3 | 4 | EPA Certification | 22,885 |
| 3 | 3 | test results | 134 |
| 3 | 3 | technician certification | 88 |
| 3 | 3 | snap | 187 |
| 3 | 3 | screenshot | 1 |
| 3 | 3 | r407c | 3 |
| 3 | 3 | n-Propyl Bromide | 17 |
| 3 | 3 | kyoto protocol | 8 |
| 3 | 3 | carbon monoxide | 30,506 |
| 3 | 3 | australia | 71 |
| 3 | 3 | ari700 | 9 |
| 3 | 3 | ODS | 249 |
| 3 | 3 | Hazardous waste | 82 |
| 3 | 3 | HVAC | 58 |
| 3 | 3 | Ammonia | 67 |
| 2 | 6 | 5 000 pounds | 33,065 |
| 2 | 5 | fire extinguishers | 18,076 |
| 2 | 5 | cfc certification | 39,719 |
| 2 | 5 | 64742-47-8 | 20,799 |
| 2 | 4 | vikane | 1,502 |
| 2 | 4 | phenolic resin | 21,478 |
| 2 | 4 | Energy Star Programs | 25,639 |
| 2 | 4 | Aircraft refrigeration | 28,224 |
| 2 | 4 | 608 test sites | 28,821 |
| 2 | 4 | 13463-67-7 | 23,249 |
| 2 | 3 | texas | 25,634 |
| 2 | 3 | te state of refrigerant leaving the condensor of a refrigeration system is | 27,832 |
| 2 | 3 | refrigerant smuggling | 9 |
| 2 | 3 | r-407c | 29,201 |
| 2 | 3 | premitted releases | 0 |
| 2 | 3 | permitted refrigerant releases | 55 |
| 2 | 3 | new york | 31,134 |
| 2 | 3 | globe warming | 9 |
| 2 | 3 | florida | 31,633 |
| 2 | 3 | energy star | 34,694 |
| 2 | 3 | chlorofluorocarbons | 29,633 |
| 2 | 3 | bromochloromethane | 5 |
| 2 | 3 | antarctic ozone holes | 29,995 |
| 2 | 3 | U122 | 15 |
| 2 | 3 | Recover refrigerant | 34,480 |
| 2 | 3 | LOGGING | 43 |
| 2 | 3 | FAQ | 110 |
| 2 | 3 | EPA 608 | 56 |
| 2 | 3 | 123 | 33,128 |
| 2 | 2 | why is the ozone hole over the antarctica | 27 |
| 2 | 2 | venting | 94 |
| 2 | 2 | universal technician | 22 |
| 2 | 2 | trichloroethane | 1,001 |
| 2 | 2 | transporting | 142 |
| 2 | 2 | transporting refrigerant | 117 |
| 2 | 2 | toluene | 4 |
| 2 | 2 | stratosphere | 39 |
| 2 | 2 | storage of refrigerant | 102 |
| 2 | 2 | sp34e | 3 |
| 2 | 2 | smuggling | 10 |
| 2 | 2 | refrigerant releases | 208 |
| 2 | 2 | record keeping | 224 |
| 2 | 2 | r417a | 3 |