EnviroNearby

Bradford County, Pennsylvania air quality history

Daily Air Quality Index summaries from EPA monitors in Bradford, Pennsylvania, 2013–2025.

82%
Good days in 2025
37
Median daily AQI, 2025
2
Days above 100 in 2025
347
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Bradford, Pennsylvania on 347 days. 283 of those days (82%) were in the Good range, and the median daily AQI was 37. That median is lower than the typical monitored county in Pennsylvania (median 40 across 38 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 210 days. Across the years with fuller monitoring, the share of Good days fell: an average of 99% in 2013–2015 versus 82% in 2023–2025.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%2013: Good 304 of 306 days2013: Moderate 2 of 306 days20132014: Good 365 of 365 days20142015: Good 352 of 365 days2015: Moderate 13 of 365 days20152016: Good 238 of 358 days2016: Moderate 120 of 358 days20162017: Good 259 of 362 days2017: Moderate 103 of 362 days20172018: Good 273 of 356 days2018: Moderate 83 of 356 days20182019: Good 273 of 352 days2019: Moderate 79 of 352 days20192020: Good 301 of 358 days2020: Moderate 57 of 358 days20202021: Good 242 of 356 days2021: Moderate 113 of 356 days2021: Unhealthy for Sensitive Groups 1 of 356 days20212022: Good 246 of 303 days2022: Moderate 57 of 303 days20222023: Good 237 of 289 days2023: Moderate 51 of 289 days2023: Unhealthy for Sensitive Groups 1 of 289 days20232024: Good 298 of 363 days2024: Moderate 65 of 363 days20242025: Good 283 of 347 days2025: Moderate 62 of 347 days2025: Unhealthy for Sensitive Groups 2 of 347 days2025
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501002013: 90th percentile AQI 442014: 90th percentile AQI 412015: 90th percentile AQI 442016: 90th percentile AQI 572017: 90th percentile AQI 572018: 90th percentile AQI 582019: 90th percentile AQI 582020: 90th percentile AQI 532021: 90th percentile AQI 612022: 90th percentile AQI 542023: 90th percentile AQI 572024: 90th percentile AQI 542025: 90th percentile AQI 542013: Median AQI 312014: Median AQI 302015: Median AQI 322016: Median AQI 432017: Median AQI 422018: Median AQI 372019: Median AQI 412020: Median AQI 392021: Median AQI 422022: Median AQI 402023: Median AQI 402024: Median AQI 372025: Median AQI 372013201420152016201720182019202020212022202320242025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Ozone21061%
Fine particles (PM2.5)12837%
Nitrogen dioxide (NO₂)93%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253472836220003754109Ozone
2024363298650000375475Ozone
20232892375110004057108Ozone
2022303246570000405480Ozone
202135624211310004261116PM2.5
2020358301570000395384Ozone
2019352273790000415878PM2.5
2018356273830000375897Ozone
20173622591030000425777PM2.5
20163582381200000435797PM2.5
2015365352130000324477Ozone
201436536500000304150Ozone
201330630420000314464Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Pennsylvania with a similar median AQI in 2025

All monitored counties in Pennsylvania

Source: U.S. EPA AirData, “Annual AQI by County” files for 2013–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem