EnviroNearby

Rockbridge County, Virginia air quality history

Daily Air Quality Index summaries from EPA monitors in Rockbridge, Virginia, 1994–2025.

94%
Good days in 2025
36
Median daily AQI, 2025
0
Days above 100 in 2025
264
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Rockbridge, Virginia on 264 days. 248 of those days (94%) were in the Good range, and the median daily AQI was 36. That median is about the same as the typical monitored county in Virginia (median 37 across 25 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 222 days. Across the years with fuller monitoring, the share of Good days rose: an average of 49% in 1999–2001 versus 94% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (264 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 (1994, 1995, 1996, 1997, 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%1994: Good 4 of 35 days1994: Moderate 31 of 35 days19941995: Good 23 of 98 days1995: Moderate 73 of 98 days1995: Unhealthy for Sensitive Groups 2 of 98 days1996: Good 25 of 98 days1996: Moderate 70 of 98 days1996: Unhealthy for Sensitive Groups 3 of 98 days1997: Good 19 of 101 days1997: Moderate 80 of 101 days1997: Unhealthy for Sensitive Groups 2 of 101 days1998: Good 24 of 103 days1998: Moderate 78 of 103 days1998: Unhealthy for Sensitive Groups 1 of 103 days1999: Good 77 of 229 days1999: Moderate 126 of 229 days1999: Unhealthy for Sensitive Groups 24 of 229 days1999: Unhealthy 2 of 229 days19992000: Good 128 of 224 days2000: Moderate 87 of 224 days2000: Unhealthy for Sensitive Groups 9 of 224 days2001: Good 139 of 250 days2001: Moderate 97 of 250 days2001: Unhealthy for Sensitive Groups 13 of 250 days2001: Unhealthy 1 of 250 days2002: Good 135 of 263 days2002: Moderate 108 of 263 days2002: Unhealthy for Sensitive Groups 20 of 263 days2003: Good 178 of 263 days2003: Moderate 80 of 263 days2003: Unhealthy for Sensitive Groups 5 of 263 days2004: Good 175 of 259 days2004: Moderate 83 of 259 days2004: Unhealthy for Sensitive Groups 1 of 259 days20042005: Good 148 of 264 days2005: Moderate 109 of 264 days2005: Unhealthy for Sensitive Groups 7 of 264 days2006: Good 173 of 264 days2006: Moderate 89 of 264 days2006: Unhealthy for Sensitive Groups 2 of 264 days2007: Good 157 of 258 days2007: Moderate 99 of 258 days2007: Unhealthy for Sensitive Groups 2 of 258 days2008: Good 189 of 265 days2008: Moderate 75 of 265 days2008: Unhealthy for Sensitive Groups 1 of 265 days2009: Good 217 of 263 days2009: Moderate 46 of 263 days20092010: Good 171 of 262 days2010: Moderate 88 of 262 days2010: Unhealthy for Sensitive Groups 3 of 262 days2011: Good 196 of 259 days2011: Moderate 63 of 259 days2012: Good 215 of 251 days2012: Moderate 35 of 251 days2012: Unhealthy for Sensitive Groups 1 of 251 days2013: Good 232 of 262 days2013: Moderate 30 of 262 days2014: Good 219 of 262 days2014: Moderate 43 of 262 days20142015: Good 229 of 263 days2015: Moderate 34 of 263 days2016: Good 239 of 264 days2016: Moderate 25 of 264 days2017: Good 264 of 285 days2017: Moderate 21 of 285 days2018: Good 243 of 268 days2018: Moderate 25 of 268 days2019: Good 259 of 274 days2019: Moderate 15 of 274 days20192020: Good 282 of 284 days2020: Moderate 2 of 284 days2021: Good 267 of 283 days2021: Moderate 16 of 283 days2022: Good 277 of 285 days2022: Moderate 8 of 285 days2023: Good 261 of 284 days2023: Moderate 21 of 284 days2023: Unhealthy 1 of 284 days2023: Very Unhealthy 1 of 284 days2024: Good 273 of 284 days2024: Moderate 11 of 284 days20242025: Good 248 of 264 days2025: Moderate 16 of 264 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 year0501001501994: 90th percentile AQI 831995: 90th percentile AQI 821996: 90th percentile AQI 801997: 90th percentile AQI 821998: 90th percentile AQI 811999: 90th percentile AQI 1052000: 90th percentile AQI 852001: 90th percentile AQI 872002: 90th percentile AQI 902003: 90th percentile AQI 682004: 90th percentile AQI 672005: 90th percentile AQI 742006: 90th percentile AQI 712007: 90th percentile AQI 712008: 90th percentile AQI 612009: 90th percentile AQI 542010: 90th percentile AQI 642011: 90th percentile AQI 592012: 90th percentile AQI 542013: 90th percentile AQI 512014: 90th percentile AQI 542015: 90th percentile AQI 512016: 90th percentile AQI 502017: 90th percentile AQI 482018: 90th percentile AQI 502019: 90th percentile AQI 472020: 90th percentile AQI 432021: 90th percentile AQI 472022: 90th percentile AQI 462023: 90th percentile AQI 492024: 90th percentile AQI 462025: 90th percentile AQI 461994: Median AQI 581995: Median AQI 601996: Median AQI 591997: Median AQI 581998: Median AQI 591999: Median AQI 612000: Median AQI 472001: Median AQI 492002: Median AQI 502003: Median AQI 432004: Median AQI 422005: Median AQI 482006: Median AQI 452007: Median AQI 472008: Median AQI 432009: Median AQI 372010: Median AQI 452011: Median AQI 432012: Median AQI 412013: Median AQI 352014: Median AQI 372015: Median AQI 382016: Median AQI 352017: Median AQI 382018: Median AQI 322019: Median AQI 382020: Median AQI 312021: Median AQI 342022: Median AQI 332023: Median AQI 372024: Median AQI 372025: Median AQI 3619941999200420092014201920242025
  • 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
Ozone22284%
Fine particles (PM2.5)4216%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025264248160000364667Ozone
2024284273110000374664Ozone
20232842612101103749240Ozone
202228527780000334671Ozone
2021283267160000344764Ozone
202028428220000314354Ozone
2019274259150000384771Ozone
2018268243250000325090Ozone
2017285264210000384880Ozone
2016264239250000355090Ozone
2015263229340000385183Ozone
2014262219430000375474Ozone
2013262232300000355171Ozone
20122512153510004154115Ozone
2011259196630000435987Ozone
20102621718830004564115Ozone
2009263217460000375480Ozone
20082651897510004361122Ozone
20072581579920004771108Ozone
20062641738920004571108Ozone
200526414810970004874119Ozone
20042591758310004267108Ozone
20032631788050004368143Ozone
2002263135108200005090143Ozone
200125013997131004987154Ozone
20002241288790004785136Ozone
1999229771262420061105182Ozone
1998103247810005981104PM2.5
1997101198020005882125PM2.5
199698257030005980115PM2.5
199598237320006082139PM2.5
1994354310000588395PM2.5

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 Virginia with a similar median AQI in 2025

All monitored counties in Virginia

Source: U.S. EPA AirData, “Annual AQI by County” files for 1994–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem