EnviroNearby

Burke County, North Carolina air quality history

Daily Air Quality Index summaries from EPA monitors in Burke, North Carolina, 1991–1994.

75%
Good days in 1994
41
Median daily AQI, 1994
17
Days above 100 in 1994
360
Days with an AQI in 1994 (of 365)

In 1994, EPA reported a daily Air Quality Index (AQI) for Burke, North Carolina on 360 days. 269 of those days (75%) 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 43 across 29 counties), and about the same as the typical monitored U.S. county (39). The main pollutant was ozone on 360 days.

The most recent year with data for this county is 1994; EPA's files for 1995–2025 contain no row for it, which usually means its monitors stopped reporting.

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%1991: Good 122 of 142 days1991: Moderate 19 of 142 days1991: Unhealthy for Sensitive Groups 1 of 142 days19911992: Good 289 of 319 days1992: Moderate 27 of 319 days1992: Unhealthy for Sensitive Groups 3 of 319 days19921993: Good 259 of 359 days1993: Moderate 90 of 359 days1993: Unhealthy for Sensitive Groups 9 of 359 days1993: Unhealthy 1 of 359 days19931994: Good 269 of 360 days1994: Moderate 74 of 360 days1994: Unhealthy for Sensitive Groups 14 of 360 days1994: Unhealthy 3 of 360 days1994
  • 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 year0501001991: 90th percentile AQI 541992: 90th percentile AQI 501993: 90th percentile AQI 771994: 90th percentile AQI 801991: Median AQI 391992: Median AQI 361993: Median AQI 421994: Median AQI 411991199219931994
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 1994

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
Ozone360100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
199436026974143004180174Ozone
19933592599091004277159Ozone
19923192892730003650108Ozone
19911421221910003954112Ozone

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.

All monitored counties in North Carolina

Source: U.S. EPA AirData, “Annual AQI by County” files for 1991–1994 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem