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Table 1 Descriptive statistics of pollen distribution from 2008–2015; Average annual season length and range based on all three types of pollen combined; a missing pollen days calculated based on days within the entire pollen season; b Total number of days over the entire study period in ‘low’ (L), ‘moderate’ (M), ‘moderately high’ (MH), ‘high’ (H) and ‘very high’ (VH) categories are based on daily pollen concentrations (grains/m3): (tree pollen: 90–250, 250–1500, > 1500; grass pollen: 19–50, 50–100, > 100; weed pollen: 50–100, 100–250, > 250). Table cells in grey indicate very low prevalence of the type of pollen if number of days in ‘high’ pollen category were <  = 10 days during the entire study period

From: Short term physician visits and medication prescriptions for allergic disease associated with seasonal tree, grass, and weed pollen exposure across the United States

Location Average (range) annual pollen season length (days) Missing pollen (% of days) a Number of Tree pollen days b Number of Grass pollen days b Number of Weed pollen days b
L M MH H VH L M MH H VH L M MH H VH
Atlanta, GA 282 (272,302) 28 1368 334 149 132 68 1809 208 34 . . 1723 274 43 11 .
Austin, TX 312 (306,327) 30 1147 358 145 196 93 1590 301 68 10 6 1704 170 44 60 .
Baltimore, MD 209 (195,229) 6 1389 163 87 122 34 1268 308 102 74 41 1572 171 44 8 .
Chicago, IL 181 (167,206) 30 740 212 123 53 6 770 266 84 14 . 619 409 81 24 1
College Station, TX 308 (294,317) 27 1453 271 125 190 51 1634 328 94 22 17 1612 300 81 89 13
Colorado Springs, CO 233 (224,247) 9 965 449 302 152 2 1188 518 135 23 6 1143 500 139 85 3
Dayton, OH 251 (235,285) 32 1360 237 120 173 35 1482 306 104 23 10 1609 210 47 59 .
Erie, PA 173 (165,190) 38 611 128 90 135 20 684 234 42 20 4 692 219 52 21 .
Eugene, OR 279 (224,344) 35 951 400 176 84 3 995 272 99 69 177 1571 44 . . .
Houston, TX 320 (314,323) 34 700 207 91 135 44 741 316 95 21 6 852 162 54 80 30
Kansas City, MO 240 (224,254) 31 868 143 106 193 75 598 424 195 81 89 780 311 82 155 60
Louisville, KY 242 (228,269) 2 2200 219 174 230 16 2449 239 109 31 11 2401 244 110 84 .
Madison, WI 186 (161,217) 46 632 111 83 107 10 789 101 48 5 . 553 222 87 80 1
Minneapolis, MN 197 (179,216) 22 662 106 81 128 38 823 137 46 7 2 616 252 88 58 1
Waterbury, CT 171 (169,182) 31 613 126 84 140 42 901 93 7 3 1 883 113 9 . .
Oklahoma City, OK 318 (269,327) 33 1007 314 192 225 60 955 392 305 124 26 1142 389 68 188 19
Omaha, NE 231 (218,250) 4 1523 214 167 164 43 1600 364 109 29 10 1349 381 143 231 8
Rochester, NY 191 (175,211) 30 729 137 167 151 2 821 198 113 40 14 846 173 54 113 .
Saint Louis, MO 261 (240,280) 30 1488 175 114 148 65 1694 178 75 27 16 1405 392 106 87 .
Salt Lake City, UT 221 (211,236) 37 874 227 69 38 2 923 235 50 1 1 754 387 63 6 .
San Antonio, TX 306 (205,328) 9 992 446 160 151 44 995 664 157 4 . 957 608 125 126 4
San Jose, CA 321 (228,333) 17 1150 790 295 136 7 2015 240 66 30 30 2184 179 17 2 .
Seattle, WA 187 (171,210) 6 658 514 231 181 19 1233 262 98 10 . 1451 141 6 4 1
Springfield, MO 229 (224,233) 31 669 133 82 107 16 502 359 101 21 23 460 413 72 62 .
Tulsa, OK 294 (252,314) 53 802 156 119 135 52 734 270 166 65 24 877 200 37 117 32
Waco, TX 330 (328,333) 30 507 353 336 571 72 1269 232 193 112 130 1364 176 89 219 88
Washington, DC 236 (212,254) 36 1191 162 120 163 25 1365 241 47 8 . 1457 195 9 . .
York, PA 204 (192,217) 33 801 172 114 150 19 1032 125 59 33 7 975 237 30 14 .