Spring allergy score: 91.13 (out of a possible 100) Kentucky's largest city ranks poorly for springtime allergies thanks partly to above-average levels of tree pollen. The 1.3-million metro area particularly has problems with pollen from red cedars, elms, willows, poplars and hackberry trees. The Derby City also has higher-than average per-patient use of allergy medications. In fact, it ranked as America's third-worst city for springtime allergies last year. On the plus side, Louisville has a better-than-average ratio of allergy doctors to allergy patients. Tringale says a high level of allergists means patients don't have to wait as long for appointments, have better odds of getting into experimental-drug trials and often get better access to the latest treatments.