EnviroNearby

Graham County, North Carolina air quality history

Daily Air Quality Index summaries from EPA monitors in Graham, North Carolina, 2003–2025.

90%
Good days in 2025
41
Median daily AQI, 2025
0
Days above 100 in 2025
245
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Graham, North Carolina on 245 days. 220 of those days (90%) were in the Good range, and the median daily AQI was 41. That median is about the same as the typical monitored county in North Carolina (median 39 across 33 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 245 days. Across the years with fuller monitoring, the share of Good days rose: an average of 55% in 2003–2005 versus 82% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (245 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

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%2003: Good 108 of 209 days2003: Moderate 87 of 209 days2003: Unhealthy for Sensitive Groups 12 of 209 days2003: Unhealthy 2 of 209 days20032004: Good 140 of 214 days2004: Moderate 67 of 214 days2004: Unhealthy for Sensitive Groups 7 of 214 days2005: Good 99 of 212 days2005: Moderate 85 of 212 days2005: Unhealthy for Sensitive Groups 28 of 212 days20052006: Good 104 of 211 days2006: Moderate 92 of 211 days2006: Unhealthy for Sensitive Groups 15 of 211 days2007: Good 46 of 144 days2007: Moderate 77 of 144 days2007: Unhealthy for Sensitive Groups 20 of 144 days2007: Unhealthy 1 of 144 days20072008: Good 129 of 207 days2008: Moderate 70 of 207 days2008: Unhealthy for Sensitive Groups 8 of 207 days2009: Good 142 of 184 days2009: Moderate 41 of 184 days2009: Unhealthy for Sensitive Groups 1 of 184 days20092010: Good 108 of 196 days2010: Moderate 76 of 196 days2010: Unhealthy for Sensitive Groups 12 of 196 days2011: Good 106 of 204 days2011: Moderate 91 of 204 days2011: Unhealthy for Sensitive Groups 7 of 204 days20112012: Good 131 of 209 days2012: Moderate 75 of 209 days2012: Unhealthy for Sensitive Groups 3 of 209 days2013: Good 178 of 214 days2013: Moderate 36 of 214 days20132014: Good 173 of 213 days2014: Moderate 39 of 213 days2014: Unhealthy for Sensitive Groups 1 of 213 days2015: Good 162 of 201 days2015: Moderate 39 of 201 days20152016: Good 162 of 213 days2016: Moderate 50 of 213 days2016: Unhealthy for Sensitive Groups 1 of 213 days2017: Good 200 of 227 days2017: Moderate 27 of 227 days20172018: Good 165 of 195 days2018: Moderate 30 of 195 days2019: Good 191 of 245 days2019: Moderate 54 of 245 days20192020: Good 223 of 238 days2020: Moderate 15 of 238 days2021: Good 213 of 245 days2021: Moderate 32 of 245 days20212022: Good 200 of 244 days2022: Moderate 41 of 244 days2022: Unhealthy for Sensitive Groups 3 of 244 days2023: Good 188 of 242 days2023: Moderate 49 of 242 days2023: Unhealthy for Sensitive Groups 5 of 242 days20232024: Good 199 of 251 days2024: Moderate 52 of 251 days2025: Good 220 of 245 days2025: Moderate 25 of 245 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 year0501001502003: 90th percentile AQI 972004: 90th percentile AQI 802005: 90th percentile AQI 1082006: 90th percentile AQI 972007: 90th percentile AQI 1122008: 90th percentile AQI 872009: 90th percentile AQI 642010: 90th percentile AQI 872011: 90th percentile AQI 872012: 90th percentile AQI 772013: 90th percentile AQI 612014: 90th percentile AQI 582015: 90th percentile AQI 612016: 90th percentile AQI 642017: 90th percentile AQI 512018: 90th percentile AQI 642019: 90th percentile AQI 612020: 90th percentile AQI 492021: 90th percentile AQI 542022: 90th percentile AQI 612023: 90th percentile AQI 672024: 90th percentile AQI 612025: 90th percentile AQI 512003: Median AQI 502004: Median AQI 462005: Median AQI 542006: Median AQI 512007: Median AQI 672008: Median AQI 472009: Median AQI 442010: Median AQI 482011: Median AQI 502012: Median AQI 482013: Median AQI 432014: Median AQI 412015: Median AQI 432016: Median AQI 452017: Median AQI 432018: Median AQI 432019: Median AQI 442020: Median AQI 402021: Median AQI 422022: Median AQI 432023: Median AQI 462024: Median AQI 442025: Median AQI 41200320052007200920112013201520172019202120232025
  • 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
Ozone245100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025245220250000415197Ozone
2024251199520000446190Ozone
20232421884950004667115Ozone
20222442004130004361112Ozone
2021245213320000425490Ozone
2020238223150000404997Ozone
2019245191540000446197Ozone
2018195165300000436493Ozone
2017227200270000435187Ozone
20162131625010004564112Ozone
2015201162390000436197Ozone
20142131733910004158101Ozone
2013214178360000436197Ozone
20122091317530004877126Ozone
20112041069170005087122Ozone
201019610876120004887119Ozone
20091841424110004464101Ozone
20082071297080004787140Ozone
200714446772010067112172Ozone
200621110492150005197140Ozone
200521299852800054108150Ozone
20042141406770004680150Ozone
200320910887122005097151Ozone

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 North Carolina with a similar median AQI in 2025

All monitored counties in North Carolina

Source: U.S. EPA AirData, “Annual AQI by County” files for 2003–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem