| Total requests for Feb 2011: 1,618 |
| Unique requests | Total requests | Query | Documents returned |
| 39 | 42 | radon | 289 |
| 22 | 25 | free radon test kit | 69 |
| 22 | 24 | Radon Test kits | 116 |
| 15 | 17 | granite countertop | 5,632 |
| 14 | 16 | granite | 7 |
| 13 | 18 | mold | 24 |
| 13 | 15 | radon mitigation | 7,468 |
| 12 | 13 | radon test | 263 |
| 11 | 14 | radon levels | 202 |
| 11 | 11 | what is radon | 296 |
| 9 | 10 | asbestos | 4 |
| 8 | 10 | granite radon | 8 |
| 7 | 13 | radon in water | 19,710 |
| 7 | 11 | pCiL | 34 |
| 6 | 9 | indoor air quality | 203 |
| 6 | 6 | test kits | 115 |
| 6 | 6 | radon maps | 182 |
| 5 | 7 | ASTM E2121-09 | 2 |
| 5 | 6 | radon contractor | 63 |
| 5 | 6 | indoor air pollution | 18,278 |
| 5 | 5 | radon in schools | 107 |
| 4 | 9 | radon in granite | 21,850 |
| 4 | 7 | safe levels of radon | 50 |
| 4 | 4 | test results | 113 |
| 4 | 4 | symptoms | 4 |
| 4 | 4 | symptoms of radon | 2 |
| 4 | 4 | sick building syndrome | 5 |
| 4 | 4 | radon kits | 121 |
| 4 | 4 | radon gas | 120 |
| 4 | 4 | mitigation | 110 |
| 4 | 4 | lead | 105 |
| 4 | 4 | carbon monoxide | 9 |
| 4 | 4 | EPA 400-R-92-001 | 1 |
| 3 | 11 | air pollutant | 28,492 |
| 3 | 7 | protect your family from lead in your home | 39 |
| 3 | 7 | EPA map of Radon Zones | 29,704 |
| 3 | 5 | black mold | 0 |
| 3 | 5 | basement | 36 |
| 3 | 4 | water testing kits | 66 |
| 3 | 4 | radon reduction | 107 |
| 3 | 4 | countertop | 26,252 |
| 3 | 4 | acceptable radon level | 6 |
| 3 | 4 | IAQ | 183 |
| 3 | 3 | zone 2 | 132 |
| 3 | 3 | radon remediation | 33,671 |
| 3 | 3 | coupon | 10 |
| 3 | 3 | certification | 26 |
| 3 | 3 | Radon Zone Map | 157 |
| 3 | 3 | Drinking Water | 159 |
| 3 | 3 | 402-r-93-078 | 2 |
| 2 | 7 | how can you test for radon | 194 |
| 2 | 5 | FAQ #5103 | 21,217 |
| 2 | 4 | granite countertop radon | 300 |
| 2 | 3 | voc | 35,669 |
| 2 | 3 | reports | 81 |
| 2 | 3 | remediation | 8 |
| 2 | 3 | region 0 | 68 |
| 2 | 3 | radon chamber | 4 |
| 2 | 3 | pennsylvania | 46 |
| 2 | 3 | español | 0 |
| 2 | 3 | alcohol | 0 |
| 2 | 3 | air quality introduction | 33,678 |
| 2 | 3 | PCB's | 21 |
| 2 | 2 | what element decays into radon | 6 |
| 2 | 2 | state radon office | 150 |
| 2 | 2 | soil suction radon reduction system | 4 |
| 2 | 2 | slab | 17 |
| 2 | 2 | radón | 0 |
| 2 | 2 | radon zones | 158 |
| 2 | 2 | radon testers | 256 |
| 2 | 2 | radon symptoms | 3 |
| 2 | 2 | radon in granite countertops | 3 |
| 2 | 2 | radon in granite counter tops | 3 |
| 2 | 2 | radon in commercial buildings | 25 |
| 2 | 2 | radon granite | 8 |
| 2 | 2 | radon granite countertops | 4 |
| 2 | 2 | radon detector | 88 |
| 2 | 2 | oregon radon | 18 |
| 2 | 2 | map | 183 |
| 2 | 2 | licensed radon inspector | 8 |
| 2 | 2 | indiana | 17 |
| 2 | 2 | granite counter top | 4 |
| 2 | 2 | free test | 134 |
| 2 | 2 | free test kits | 72 |
| 2 | 2 | formaldehyde | 2 |
| 2 | 2 | fixing radon | 212 |
| 2 | 2 | fetus | 0 |
| 2 | 2 | epa625r93011 | 2 |
| 2 | 2 | epa6255-88024 | 8 |
| 2 | 2 | crawlspaces | 7 |
| 2 | 2 | consumers guide to radon | 64 |
| 2 | 2 | citizen guide | 65 |
| 2 | 2 | buyers guide | 51 |
| 2 | 2 | acceptable levels of radon | 7 |
| 2 | 2 | Ventura County CA | 1 |
| 2 | 2 | Test Methods | 152 |
| 2 | 2 | Technical Support Document for the 1992 Citizens Guide to Radon EPA Document Number 400-R-92-011 May 1992 | 2 |
| 2 | 2 | Sump pump | 7 |
| 2 | 2 | Radon deaths | 74 |
| 2 | 2 | Philadelphia Pa | 7 |
| 2 | 2 | NEW YORK STATE | 40 |