EnviroNearby

Burke County, North Dakota air quality history

Daily Air Quality Index summaries from EPA monitors in Burke, North Dakota, 1987–2025.

76%
Good days in 2025
38
Median daily AQI, 2025
13
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Burke, North Dakota on 365 days. 278 of those days (76%) were in the Good range, and the median daily AQI was 38. That median is about the same as the typical monitored county in North Dakota (median 38 across 9 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 229 days. Across the years with fuller monitoring, the share of Good days fell: an average of 100% in 1988–1990 versus 74% in 2023–2025.

Years with fewer than 120 monitored days (1987, 1998) are shown in the table but left out of comparisons and trend statements.

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%1987: Good 58 of 58 days19871988: Good 191 of 191 days1989: Good 314 of 315 days1989: Moderate 1 of 315 days1990: Good 349 of 349 days1998: Good 20 of 20 days1999: Good 312 of 316 days1999: Moderate 4 of 316 days19992000: Good 346 of 365 days2000: Moderate 19 of 365 days2001: Good 351 of 365 days2001: Moderate 14 of 365 days2002: Good 355 of 364 days2002: Moderate 9 of 364 days2003: Good 326 of 342 days2003: Moderate 16 of 342 days2004: Good 341 of 366 days2004: Moderate 25 of 366 days20042005: Good 344 of 365 days2005: Moderate 21 of 365 days2006: Good 325 of 365 days2006: Moderate 40 of 365 days2007: Good 341 of 365 days2007: Moderate 24 of 365 days2008: Good 344 of 366 days2008: Moderate 22 of 366 days2009: Good 336 of 354 days2009: Moderate 18 of 354 days20092010: Good 289 of 363 days2010: Moderate 74 of 363 days2011: Good 273 of 361 days2011: Moderate 88 of 361 days2012: Good 288 of 366 days2012: Moderate 78 of 366 days2013: Good 303 of 365 days2013: Moderate 62 of 365 days2014: Good 316 of 364 days2014: Moderate 48 of 364 days20142015: Good 290 of 364 days2015: Moderate 64 of 364 days2015: Unhealthy for Sensitive Groups 6 of 364 days2015: Unhealthy 4 of 364 days2016: Good 350 of 365 days2016: Moderate 15 of 365 days2017: Good 313 of 363 days2017: Moderate 49 of 363 days2017: Unhealthy for Sensitive Groups 1 of 363 days2018: Good 311 of 361 days2018: Moderate 49 of 361 days2018: Unhealthy for Sensitive Groups 1 of 361 days2019: Good 348 of 365 days2019: Moderate 17 of 365 days20192020: Good 340 of 366 days2020: Moderate 26 of 366 days2021: Good 283 of 365 days2021: Moderate 73 of 365 days2021: Unhealthy for Sensitive Groups 7 of 365 days2021: Unhealthy 2 of 365 days2022: Good 304 of 363 days2022: Moderate 59 of 363 days2023: Good 221 of 361 days2023: Moderate 119 of 361 days2023: Unhealthy for Sensitive Groups 11 of 361 days2023: Unhealthy 9 of 361 days2023: Very Unhealthy 1 of 361 days2024: Good 304 of 365 days2024: Moderate 51 of 365 days2024: Unhealthy for Sensitive Groups 9 of 365 days2024: Unhealthy 1 of 365 days20242025: Good 278 of 365 days2025: Moderate 74 of 365 days2025: Unhealthy for Sensitive Groups 4 of 365 days2025: Unhealthy 8 of 365 days2025: Very Unhealthy 1 of 365 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 year0501001987: 90th percentile AQI 191988: 90th percentile AQI 151989: 90th percentile AQI 81990: 90th percentile AQI 51998: 90th percentile AQI 191999: 90th percentile AQI 232000: 90th percentile AQI 382001: 90th percentile AQI 412002: 90th percentile AQI 352003: 90th percentile AQI 372004: 90th percentile AQI 472005: 90th percentile AQI 472006: 90th percentile AQI 512007: 90th percentile AQI 462008: 90th percentile AQI 482009: 90th percentile AQI 472010: 90th percentile AQI 552011: 90th percentile AQI 552012: 90th percentile AQI 552013: 90th percentile AQI 552014: 90th percentile AQI 522015: 90th percentile AQI 552016: 90th percentile AQI 452017: 90th percentile AQI 542018: 90th percentile AQI 542019: 90th percentile AQI 472020: 90th percentile AQI 472021: 90th percentile AQI 672022: 90th percentile AQI 552023: 90th percentile AQI 812024: 90th percentile AQI 562025: 90th percentile AQI 671987: Median AQI 101988: Median AQI 41989: Median AQI 01990: Median AQI 01998: Median AQI 61999: Median AQI 62000: Median AQI 92001: Median AQI 82002: Median AQI 82003: Median AQI 122004: Median AQI 332005: Median AQI 332006: Median AQI 352007: Median AQI 332008: Median AQI 352009: Median AQI 332010: Median AQI 402011: Median AQI 422012: Median AQI 402013: Median AQI 372014: Median AQI 372015: Median AQI 392016: Median AQI 332017: Median AQI 362018: Median AQI 342019: Median AQI 342020: Median AQI 352021: Median AQI 382022: Median AQI 402023: Median AQI 442024: Median AQI 382025: Median AQI 3819871999200420092014201920242025
  • 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
Ozone22963%
Fine particles (PM2.5)13637%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652787448103867285Ozone
20243653045191003856178Ozone
2023361221119119104481287Ozone
2022363304590000405577Ozone
20213652837372003867183Ozone
2020366340260000354773Ozone
2019365348170000344767Ozone
20183613114910003454108Ozone
20173633134910003654135Ozone
2016365350150000334578Ozone
20153642906464003955189Ozone
2014364316480000375293Ozone
2013365303620000375593Ozone
2012366288780000405590PM2.5
2011361273880000425584PM2.5
2010363289740000405590Ozone
2009354336180000334769Ozone
2008366344220000354871Ozone
2007365341240000334677Ozone
2006365325400000355180Ozone
2005365344210000334768Ozone
2004366341250000334790Ozone
2003342326160000123793NO2
20023643559000083569NO2
200136535114000084177NO2
200036534619000093873NO2
19993163124000062375NO2
199820200000061935PM10
1990349349000000525NO2
1989315314100000851NO2
19881911910000041540NO2
1987585800000101947PM10

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 Dakota with a similar median AQI in 2025

All monitored counties in North Dakota

Source: U.S. EPA AirData, “Annual AQI by County” files for 1987–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem