EnviroNearby

Martin County, North Carolina air quality history

Daily Air Quality Index summaries from EPA monitors in Martin, North Carolina, 1983–2025.

100%
Good days in 2025
31
Median daily AQI, 2025
0
Days above 100 in 2025
289
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Martin, North Carolina on 289 days. 289 of those days (100%) were in the Good range, and the median daily AQI was 31. That median is lower than the typical monitored county in North Carolina (median 39 across 33 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 241 days. Across the years with fuller monitoring, the share of Good days rose: an average of 58% in 1983–1985 versus 98% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (289 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%1983: Good 66 of 123 days1983: Moderate 37 of 123 days1983: Unhealthy for Sensitive Groups 16 of 123 days1983: Unhealthy 4 of 123 days19831984: Good 115 of 195 days1984: Moderate 55 of 195 days1984: Unhealthy for Sensitive Groups 20 of 195 days1984: Unhealthy 5 of 195 days1985: Good 120 of 194 days1985: Moderate 59 of 194 days1985: Unhealthy for Sensitive Groups 14 of 194 days1985: Unhealthy 1 of 194 days1986: Good 106 of 206 days1986: Moderate 73 of 206 days1986: Unhealthy for Sensitive Groups 24 of 206 days1986: Unhealthy 3 of 206 days1989: Good 143 of 209 days1989: Moderate 59 of 209 days1989: Unhealthy for Sensitive Groups 7 of 209 days1992: Good 154 of 213 days1992: Moderate 52 of 213 days1992: Unhealthy for Sensitive Groups 5 of 213 days1992: Unhealthy 2 of 213 days19921995: Good 135 of 210 days1995: Moderate 64 of 210 days1995: Unhealthy for Sensitive Groups 11 of 210 days1997: Good 128 of 214 days1997: Moderate 66 of 214 days1997: Unhealthy for Sensitive Groups 20 of 214 days1998: Good 125 of 214 days1998: Moderate 73 of 214 days1998: Unhealthy for Sensitive Groups 15 of 214 days1998: Unhealthy 1 of 214 days1999: Good 135 of 212 days1999: Moderate 56 of 212 days1999: Unhealthy for Sensitive Groups 19 of 212 days1999: Unhealthy 2 of 212 days2000: Good 118 of 211 days2000: Moderate 64 of 211 days2000: Unhealthy for Sensitive Groups 28 of 211 days2000: Unhealthy 1 of 211 days20002001: Good 129 of 213 days2001: Moderate 67 of 213 days2001: Unhealthy for Sensitive Groups 17 of 213 days2002: Good 122 of 211 days2002: Moderate 66 of 211 days2002: Unhealthy for Sensitive Groups 17 of 211 days2002: Unhealthy 6 of 211 days2003: Good 160 of 223 days2003: Moderate 55 of 223 days2003: Unhealthy for Sensitive Groups 6 of 223 days2003: Unhealthy 2 of 223 days2004: Good 155 of 252 days2004: Moderate 92 of 252 days2004: Unhealthy for Sensitive Groups 5 of 252 days2005: Good 150 of 254 days2005: Moderate 94 of 254 days2005: Unhealthy for Sensitive Groups 9 of 254 days2005: Unhealthy 1 of 254 days20052006: Good 163 of 363 days2006: Moderate 195 of 363 days2006: Unhealthy for Sensitive Groups 5 of 363 days2007: Good 157 of 331 days2007: Moderate 165 of 331 days2007: Unhealthy for Sensitive Groups 9 of 331 days2008: Good 160 of 358 days2008: Moderate 190 of 358 days2008: Unhealthy for Sensitive Groups 7 of 358 days2008: Unhealthy 1 of 358 days2009: Good 211 of 342 days2009: Moderate 131 of 342 days2010: Good 201 of 357 days2010: Moderate 153 of 357 days2010: Unhealthy for Sensitive Groups 3 of 357 days20102011: Good 205 of 345 days2011: Moderate 137 of 345 days2011: Unhealthy for Sensitive Groups 2 of 345 days2011: Unhealthy 1 of 345 days2012: Good 237 of 358 days2012: Moderate 120 of 358 days2012: Unhealthy for Sensitive Groups 1 of 358 days2013: Good 178 of 362 days2013: Moderate 184 of 362 days2014: Good 189 of 359 days2014: Moderate 170 of 359 days2015: Good 252 of 351 days2015: Moderate 99 of 351 days20152016: Good 200 of 213 days2016: Moderate 13 of 213 days2017: Good 231 of 244 days2017: Moderate 13 of 244 days2018: Good 261 of 289 days2018: Moderate 28 of 289 days2019: Good 261 of 295 days2019: Moderate 34 of 295 days2020: Good 240 of 240 days20202021: Good 291 of 296 days2021: Moderate 5 of 296 days2022: Good 282 of 289 days2022: Moderate 7 of 289 days2023: Good 230 of 244 days2023: Moderate 14 of 244 days2024: Good 304 of 305 days2024: Moderate 1 of 305 days2025: Good 289 of 289 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 year0501001501983: 90th percentile AQI 1261984: 90th percentile AQI 1121985: 90th percentile AQI 971986: 90th percentile AQI 1081989: 90th percentile AQI 771992: 90th percentile AQI 771995: 90th percentile AQI 801997: 90th percentile AQI 971998: 90th percentile AQI 971999: 90th percentile AQI 972000: 90th percentile AQI 1122001: 90th percentile AQI 972002: 90th percentile AQI 1052003: 90th percentile AQI 742004: 90th percentile AQI 782005: 90th percentile AQI 772006: 90th percentile AQI 742007: 90th percentile AQI 772008: 90th percentile AQI 712009: 90th percentile AQI 622010: 90th percentile AQI 672011: 90th percentile AQI 672012: 90th percentile AQI 582013: 90th percentile AQI 622014: 90th percentile AQI 622015: 90th percentile AQI 572016: 90th percentile AQI 482017: 90th percentile AQI 482018: 90th percentile AQI 502019: 90th percentile AQI 512020: 90th percentile AQI 422021: 90th percentile AQI 462022: 90th percentile AQI 442023: 90th percentile AQI 472024: 90th percentile AQI 432025: 90th percentile AQI 411983: Median AQI 481984: Median AQI 471985: Median AQI 461986: Median AQI 501989: Median AQI 421992: Median AQI 421995: Median AQI 441997: Median AQI 461998: Median AQI 481999: Median AQI 462000: Median AQI 492001: Median AQI 462002: Median AQI 472003: Median AQI 422004: Median AQI 462005: Median AQI 472006: Median AQI 522007: Median AQI 522008: Median AQI 522009: Median AQI 462010: Median AQI 482011: Median AQI 462012: Median AQI 432013: Median AQI 512014: Median AQI 492015: Median AQI 442016: Median AQI 362017: Median AQI 382018: Median AQI 342019: Median AQI 402020: Median AQI 332021: Median AQI 322022: Median AQI 342023: Median AQI 362024: Median AQI 312025: Median AQI 3119831992200020052010201520202025
  • 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
Ozone24183%
Coarse particles (PM10)4817%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202528928900000314150Ozone
202430530410000314361Ozone
2023244230140000364777Ozone
202228928270000344480Ozone
202129629150000324674Ozone
202024024000000334249Ozone
2019295261340000405174Ozone
2018289261280000345080Ozone
2017244231130000384874Ozone
2016213200130000364897Ozone
2015351252990000445771PM2.5
20143591891700000496297PM2.5
20133621781840000516290PM2.5
201235823712010004358140PM2.5
201134520513721004667180PM2.5
201035720115330004867133PM2.5
20093422111310000466297PM2.5
200835816019071005271176PM2.5
200733115716590005277129PM2.5
200636316319550005274137PM2.5
20052541509491004777154Ozone
20042521559250004678126Ozone
20032231605562004274177Ozone
2002211122661760047105172Ozone
200121312967170004697133Ozone
2000211118642810049112159Ozone
199921213556192004697174Ozone
199821412573151004897154Ozone
199721412866200004697147Ozone
199521013564110004480133Ozone
19922131545252004277161Ozone
19892091435970004277133Ozone
1986206106732430050108177Ozone
198519412059141004697164Ozone
1984195115552050047112177Ozone
198312366371640048126156Ozone

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 1983–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem