15. Syracuse, NY
> Fine particulate matter pollution 24-hr average: 14 µg/m3 (EPA standard: 35 µg/m3)
> Avg. nitrogen dioxide concentration: . ppb (EPA standard: 53 ppb)
> Total population: 650,211
> Fall 2022 allergy ranking: #13 out of 100
14. Dayton, OH
> Fine particulate matter pollution 24-hr average: 20 µg/m3 (EPA standard: 35 µg/m3)
> Avg. nitrogen dioxide concentration: . ppb (EPA standard: 53 ppb)
> Total population: 805,929
> Fall 2022 allergy ranking: #12 out of 100
13. San Antonio, TX
> Fine particulate matter pollution 24-hr average: 23 µg/m3 (EPA standard: 35 µg/m3)
> Avg. nitrogen dioxide concentration: 8 ppb (EPA standard: 53 ppb)
> Total population: 2,510,211
> Fall 2022 allergy ranking: #4 out of 100
12. Columbia, SC
> Fine particulate matter pollution 24-hr average: 17 µg/m3 (EPA standard: 35 µg/m3)
> Avg. nitrogen dioxide concentration: 3 ppb (EPA standard: 53 ppb)
> Total population: 832,925
> Fall 2022 allergy ranking: #16 out of 100
11. Buffalo, NY
> Fine particulate matter pollution 24-hr average: 19 µg/m3 (EPA standard: 35 µg/m3)
> Avg. nitrogen dioxide concentration: 8 ppb (EPA standard: 53 ppb)
> Total population: 1,129,018
> Fall 2022 allergy ranking: #7 out of 100
