EnviroNearby

Alexander County, North Carolina air quality history

Daily Air Quality Index summaries from EPA monitors in Alexander, North Carolina, 1982–2025.

93%
Good days in 2025
38
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 Alexander, North Carolina on 245 days. 229 of those days (93%) 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 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 67% in 1982–1984 versus 90% 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.

Years with fewer than 120 monitored days (1988, 1992, 1993, 1995) 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%1982: Good 142 of 153 days1982: Moderate 10 of 153 days1982: Unhealthy for Sensitive Groups 1 of 153 days19821983: Good 75 of 161 days1983: Moderate 54 of 161 days1983: Unhealthy for Sensitive Groups 27 of 161 days1983: Unhealthy 5 of 161 days1984: Good 126 of 207 days1984: Moderate 58 of 207 days1984: Unhealthy for Sensitive Groups 21 of 207 days1984: Unhealthy 2 of 207 days1985: Good 111 of 214 days1985: Moderate 80 of 214 days1985: Unhealthy for Sensitive Groups 23 of 214 days1987: Good 86 of 198 days1987: Moderate 82 of 198 days1987: Unhealthy for Sensitive Groups 27 of 198 days1987: Unhealthy 3 of 198 days1988: Good 25 of 50 days1988: Moderate 15 of 50 days1988: Unhealthy for Sensitive Groups 9 of 50 days1988: Unhealthy 1 of 50 days19881990: Good 100 of 214 days1990: Moderate 88 of 214 days1990: Unhealthy for Sensitive Groups 26 of 214 days1992: Good 7 of 7 days1993: Good 56 of 57 days1993: Moderate 1 of 57 days1994: Good 157 of 232 days1994: Moderate 65 of 232 days1994: Unhealthy for Sensitive Groups 9 of 232 days1994: Unhealthy 1 of 232 days1995: Good 60 of 60 days19951996: Good 147 of 237 days1996: Moderate 75 of 237 days1996: Unhealthy for Sensitive Groups 15 of 237 days1997: Good 131 of 235 days1997: Moderate 82 of 235 days1997: Unhealthy for Sensitive Groups 20 of 235 days1997: Unhealthy 2 of 235 days1998: Good 91 of 213 days1998: Moderate 66 of 213 days1998: Unhealthy for Sensitive Groups 44 of 213 days1998: Unhealthy 10 of 213 days1998: Very Unhealthy 2 of 213 days1999: Good 148 of 214 days1999: Moderate 53 of 214 days1999: Unhealthy for Sensitive Groups 11 of 214 days1999: Unhealthy 2 of 214 days2000: Good 94 of 211 days2000: Moderate 64 of 211 days2000: Unhealthy for Sensitive Groups 48 of 211 days2000: Unhealthy 5 of 211 days20002001: Good 98 of 214 days2001: Moderate 84 of 214 days2001: Unhealthy for Sensitive Groups 28 of 214 days2001: Unhealthy 4 of 214 days2002: Good 102 of 214 days2002: Moderate 60 of 214 days2002: Unhealthy for Sensitive Groups 35 of 214 days2002: Unhealthy 17 of 214 days2003: Good 134 of 213 days2003: Moderate 62 of 213 days2003: Unhealthy for Sensitive Groups 16 of 213 days2003: Unhealthy 1 of 213 days2004: Good 174 of 214 days2004: Moderate 36 of 214 days2004: Unhealthy for Sensitive Groups 4 of 214 days2005: Good 131 of 214 days2005: Moderate 71 of 214 days2005: Unhealthy for Sensitive Groups 12 of 214 days20052006: Good 129 of 214 days2006: Moderate 75 of 214 days2006: Unhealthy for Sensitive Groups 10 of 214 days2007: Good 97 of 213 days2007: Moderate 93 of 213 days2007: Unhealthy for Sensitive Groups 23 of 213 days2008: Good 132 of 211 days2008: Moderate 68 of 211 days2008: Unhealthy for Sensitive Groups 11 of 211 days2009: Good 175 of 202 days2009: Moderate 27 of 202 days2010: Good 132 of 214 days2010: Moderate 75 of 214 days2010: Unhealthy for Sensitive Groups 7 of 214 days20102011: Good 155 of 210 days2011: Moderate 52 of 210 days2011: Unhealthy for Sensitive Groups 3 of 210 days2012: Good 161 of 209 days2012: Moderate 46 of 209 days2012: Unhealthy for Sensitive Groups 2 of 209 days2013: Good 197 of 213 days2013: Moderate 16 of 213 days2014: Good 190 of 214 days2014: Moderate 24 of 214 days2015: Good 173 of 209 days2015: Moderate 36 of 209 days20152016: Good 246 of 278 days2016: Moderate 32 of 278 days2017: Good 272 of 293 days2017: Moderate 21 of 293 days2018: Good 198 of 233 days2018: Moderate 35 of 233 days2019: Good 274 of 305 days2019: Moderate 31 of 305 days2020: Good 297 of 300 days2020: Moderate 3 of 300 days20202021: Good 212 of 245 days2021: Moderate 33 of 245 days2022: Good 280 of 300 days2022: Moderate 20 of 300 days2023: Good 275 of 302 days2023: Moderate 26 of 302 days2023: Unhealthy for Sensitive Groups 1 of 302 days2024: Good 213 of 245 days2024: Moderate 32 of 245 days2025: Good 229 of 245 days2025: Moderate 16 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 year0501001501982: 90th percentile AQI 491983: 90th percentile AQI 1331984: 90th percentile AQI 1011985: 90th percentile AQI 1011987: 90th percentile AQI 1151988: 90th percentile AQI 1151990: 90th percentile AQI 1051992: 90th percentile AQI 231993: 90th percentile AQI 361994: 90th percentile AQI 871995: 90th percentile AQI 311996: 90th percentile AQI 871997: 90th percentile AQI 1001998: 90th percentile AQI 1331999: 90th percentile AQI 932000: 90th percentile AQI 1262001: 90th percentile AQI 1122002: 90th percentile AQI 1432003: 90th percentile AQI 932004: 90th percentile AQI 712005: 90th percentile AQI 932006: 90th percentile AQI 842007: 90th percentile AQI 1052008: 90th percentile AQI 842009: 90th percentile AQI 512010: 90th percentile AQI 842011: 90th percentile AQI 642012: 90th percentile AQI 672013: 90th percentile AQI 492014: 90th percentile AQI 512015: 90th percentile AQI 612016: 90th percentile AQI 512017: 90th percentile AQI 492018: 90th percentile AQI 582019: 90th percentile AQI 512020: 90th percentile AQI 452021: 90th percentile AQI 542022: 90th percentile AQI 492023: 90th percentile AQI 502024: 90th percentile AQI 512025: 90th percentile AQI 491982: Median AQI 371983: Median AQI 541984: Median AQI 461985: Median AQI 501987: Median AQI 581988: Median AQI 541990: Median AQI 511992: Median AQI 171993: Median AQI 201994: Median AQI 441995: Median AQI 191996: Median AQI 461997: Median AQI 471998: Median AQI 641999: Median AQI 442000: Median AQI 582001: Median AQI 542002: Median AQI 542003: Median AQI 462004: Median AQI 422005: Median AQI 472006: Median AQI 482007: Median AQI 542008: Median AQI 462009: Median AQI 382010: Median AQI 462011: Median AQI 462012: Median AQI 442013: Median AQI 402014: Median AQI 402015: Median AQI 432016: Median AQI 392017: Median AQI 382018: Median AQI 402019: Median AQI 392020: Median AQI 332021: Median AQI 412022: Median AQI 372023: Median AQI 382024: Median AQI 412025: Median AQI 38198219881995200020052010201520202025
  • 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
2025245229160000384980Ozone
2024245213320000415193Ozone
20233022752610003850105Ozone
2022300280200000374990Ozone
2021245212330000415480Ozone
202030029730000334554Ozone
2019305274310000395180Ozone
20182331983500004058100Ozone
2017293272210000384993Ozone
20162782463200003951100Ozone
2015209173360000436190Ozone
2014214190240000405197Ozone
20132131971600004049100Ozone
20122091614620004467126Ozone
20112101555230004664105Ozone
20102141327570004684140Ozone
2009202175270000385193Ozone
200821113268110004684147Ozone
200721397932300054105147Ozone
200621412975100004884140Ozone
200521413171120004793143Ozone
20042141743640004271122Ozone
200321313462161004693151Ozone
20022141026035170054143195Ozone
200121498842840054112169Ozone
200021194644850058126182Ozone
199921414853112004493187Ozone
1998213916644102064133213Ozone
1997235131822020047100166Ozone
199623714775150004687143Ozone
1995606000000193148PM10
19942321576591004487151Ozone
1993575610000203655PM10
19927700000172323PM10
1990214100882600051105150Ozone
1988502515910054115177Ozone
198719886822730058115161Ozone
1985214111802300050101147Ozone
1984207126582120046101156Ozone
198316175542750054133185Ozone
19821531421010003749112Ozone

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 1982–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem