EnviroNearby

Rockingham County, New Hampshire air quality history

Daily Air Quality Index summaries from EPA monitors in Rockingham, New Hampshire, 1980–2025.

85%
Good days in 2025
38
Median daily AQI, 2025
2
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 Rockingham, New Hampshire on 365 days. 309 of those days (85%) were in the Good range, and the median daily AQI was 38. That median is about the same as the typical monitored county in New Hampshire (median 37 across 7 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 275 days. Across the years with fuller monitoring, the share of Good days fell: an average of 89% in 1980–1982 versus 81% in 2023–2025.

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%1980: Good 267 of 330 days1980: Moderate 42 of 330 days1980: Unhealthy for Sensitive Groups 12 of 330 days1980: Unhealthy 6 of 330 days1980: Very Unhealthy 3 of 330 days19801981: Good 294 of 314 days1981: Moderate 11 of 314 days1981: Unhealthy for Sensitive Groups 3 of 314 days1981: Unhealthy 5 of 314 days1981: Very Unhealthy 1 of 314 days1982: Good 321 of 351 days1982: Moderate 20 of 351 days1982: Unhealthy for Sensitive Groups 5 of 351 days1982: Unhealthy 3 of 351 days1982: Very Unhealthy 2 of 351 days1983: Good 310 of 361 days1983: Moderate 33 of 361 days1983: Unhealthy for Sensitive Groups 12 of 361 days1983: Unhealthy 5 of 361 days1983: Very Unhealthy 1 of 361 days1984: Good 345 of 348 days1984: Moderate 3 of 348 days1985: Good 331 of 362 days1985: Moderate 21 of 362 days1985: Unhealthy for Sensitive Groups 6 of 362 days1985: Unhealthy 4 of 362 days19851986: Good 275 of 295 days1986: Moderate 10 of 295 days1986: Unhealthy for Sensitive Groups 5 of 295 days1986: Unhealthy 5 of 295 days1987: Good 166 of 224 days1987: Moderate 34 of 224 days1987: Unhealthy for Sensitive Groups 15 of 224 days1987: Unhealthy 7 of 224 days1987: Very Unhealthy 2 of 224 days1988: Good 178 of 236 days1988: Moderate 23 of 236 days1988: Unhealthy for Sensitive Groups 12 of 236 days1988: Unhealthy 17 of 236 days1988: Very Unhealthy 6 of 236 days1989: Good 187 of 239 days1989: Moderate 35 of 239 days1989: Unhealthy for Sensitive Groups 8 of 239 days1989: Unhealthy 7 of 239 days1989: Very Unhealthy 2 of 239 days1990: Good 241 of 290 days1990: Moderate 30 of 290 days1990: Unhealthy for Sensitive Groups 16 of 290 days1990: Unhealthy 3 of 290 days19901991: Good 276 of 334 days1991: Moderate 39 of 334 days1991: Unhealthy for Sensitive Groups 11 of 334 days1991: Unhealthy 3 of 334 days1991: Very Unhealthy 5 of 334 days1992: Good 323 of 363 days1992: Moderate 22 of 363 days1992: Unhealthy for Sensitive Groups 13 of 363 days1992: Unhealthy 4 of 363 days1992: Very Unhealthy 1 of 363 days1993: Good 317 of 359 days1993: Moderate 24 of 359 days1993: Unhealthy for Sensitive Groups 11 of 359 days1993: Unhealthy 7 of 359 days1994: Good 301 of 358 days1994: Moderate 36 of 358 days1994: Unhealthy for Sensitive Groups 12 of 358 days1994: Unhealthy 8 of 358 days1994: Very Unhealthy 1 of 358 days1995: Good 322 of 358 days1995: Moderate 22 of 358 days1995: Unhealthy for Sensitive Groups 9 of 358 days1995: Unhealthy 5 of 358 days19951996: Good 299 of 361 days1996: Moderate 47 of 361 days1996: Unhealthy for Sensitive Groups 10 of 361 days1996: Unhealthy 5 of 361 days1997: Good 310 of 357 days1997: Moderate 30 of 357 days1997: Unhealthy for Sensitive Groups 8 of 357 days1997: Unhealthy 6 of 357 days1997: Very Unhealthy 3 of 357 days1998: Good 302 of 364 days1998: Moderate 49 of 364 days1998: Unhealthy for Sensitive Groups 9 of 364 days1998: Unhealthy 4 of 364 days1999: Good 281 of 351 days1999: Moderate 51 of 351 days1999: Unhealthy for Sensitive Groups 14 of 351 days1999: Unhealthy 4 of 351 days1999: Very Unhealthy 1 of 351 days2000: Good 300 of 364 days2000: Moderate 61 of 364 days2000: Unhealthy for Sensitive Groups 3 of 364 days20002001: Good 282 of 365 days2001: Moderate 64 of 365 days2001: Unhealthy for Sensitive Groups 11 of 365 days2001: Unhealthy 7 of 365 days2001: Very Unhealthy 1 of 365 days2002: Good 278 of 365 days2002: Moderate 61 of 365 days2002: Unhealthy for Sensitive Groups 15 of 365 days2002: Unhealthy 10 of 365 days2002: Very Unhealthy 1 of 365 days2003: Good 284 of 363 days2003: Moderate 69 of 363 days2003: Unhealthy for Sensitive Groups 10 of 363 days2004: Good 298 of 361 days2004: Moderate 56 of 361 days2004: Unhealthy for Sensitive Groups 6 of 361 days2004: Unhealthy 1 of 361 days2005: Good 283 of 365 days2005: Moderate 73 of 365 days2005: Unhealthy for Sensitive Groups 9 of 365 days20052006: Good 296 of 363 days2006: Moderate 57 of 363 days2006: Unhealthy for Sensitive Groups 10 of 363 days2007: Good 287 of 360 days2007: Moderate 64 of 360 days2007: Unhealthy for Sensitive Groups 5 of 360 days2007: Unhealthy 4 of 360 days2008: Good 298 of 360 days2008: Moderate 56 of 360 days2008: Unhealthy for Sensitive Groups 6 of 360 days2009: Good 262 of 306 days2009: Moderate 41 of 306 days2009: Unhealthy for Sensitive Groups 3 of 306 days2010: Good 281 of 363 days2010: Moderate 78 of 363 days2010: Unhealthy for Sensitive Groups 3 of 363 days2010: Unhealthy 1 of 363 days20102011: Good 219 of 365 days2011: Moderate 143 of 365 days2011: Unhealthy for Sensitive Groups 2 of 365 days2011: Unhealthy 1 of 365 days2012: Good 255 of 366 days2012: Moderate 106 of 366 days2012: Unhealthy for Sensitive Groups 5 of 366 days2013: Good 190 of 365 days2013: Moderate 172 of 365 days2013: Unhealthy for Sensitive Groups 3 of 365 days2014: Good 157 of 365 days2014: Moderate 204 of 365 days2014: Unhealthy for Sensitive Groups 4 of 365 days2015: Good 202 of 365 days2015: Moderate 161 of 365 days2015: Unhealthy for Sensitive Groups 2 of 365 days20152016: Good 289 of 366 days2016: Moderate 75 of 366 days2016: Unhealthy for Sensitive Groups 2 of 366 days2017: Good 310 of 365 days2017: Moderate 53 of 365 days2017: Unhealthy for Sensitive Groups 2 of 365 days2018: Good 309 of 365 days2018: Moderate 53 of 365 days2018: Unhealthy for Sensitive Groups 3 of 365 days2019: Good 319 of 365 days2019: Moderate 45 of 365 days2019: Unhealthy for Sensitive Groups 1 of 365 days2020: Good 296 of 366 days2020: Moderate 70 of 366 days20202021: Good 285 of 365 days2021: Moderate 76 of 365 days2021: Unhealthy for Sensitive Groups 4 of 365 days2022: Good 292 of 365 days2022: Moderate 71 of 365 days2022: Unhealthy for Sensitive Groups 2 of 365 days2023: Good 276 of 365 days2023: Moderate 89 of 365 days2024: Good 306 of 366 days2024: Moderate 59 of 366 days2024: Unhealthy for Sensitive Groups 1 of 366 days2025: Good 309 of 365 days2025: Moderate 54 of 365 days2025: Unhealthy for Sensitive Groups 2 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 year0501001501980: 90th percentile AQI 791981: 90th percentile AQI 451982: 90th percentile AQI 471983: 90th percentile AQI 671984: 90th percentile AQI 391985: 90th percentile AQI 481986: 90th percentile AQI 461987: 90th percentile AQI 1011988: 90th percentile AQI 1431989: 90th percentile AQI 871990: 90th percentile AQI 711991: 90th percentile AQI 711992: 90th percentile AQI 541993: 90th percentile AQI 611994: 90th percentile AQI 711995: 90th percentile AQI 511996: 90th percentile AQI 671997: 90th percentile AQI 581998: 90th percentile AQI 641999: 90th percentile AQI 692000: 90th percentile AQI 582001: 90th percentile AQI 712002: 90th percentile AQI 802003: 90th percentile AQI 702004: 90th percentile AQI 592005: 90th percentile AQI 612006: 90th percentile AQI 632007: 90th percentile AQI 592008: 90th percentile AQI 612009: 90th percentile AQI 572010: 90th percentile AQI 622011: 90th percentile AQI 662012: 90th percentile AQI 642013: 90th percentile AQI 672014: 90th percentile AQI 642015: 90th percentile AQI 642016: 90th percentile AQI 582017: 90th percentile AQI 552018: 90th percentile AQI 552019: 90th percentile AQI 522020: 90th percentile AQI 562021: 90th percentile AQI 582022: 90th percentile AQI 552023: 90th percentile AQI 592024: 90th percentile AQI 562025: 90th percentile AQI 541980: Median AQI 361981: Median AQI 261982: Median AQI 291983: Median AQI 311984: Median AQI 211985: Median AQI 271986: Median AQI 291987: Median AQI 381988: Median AQI 371989: Median AQI 381990: Median AQI 371991: Median AQI 351992: Median AQI 311993: Median AQI 311994: Median AQI 341995: Median AQI 311996: Median AQI 351997: Median AQI 351998: Median AQI 331999: Median AQI 342000: Median AQI 342001: Median AQI 382002: Median AQI 382003: Median AQI 382004: Median AQI 362005: Median AQI 342006: Median AQI 342007: Median AQI 322008: Median AQI 332009: Median AQI 332010: Median AQI 392011: Median AQI 462012: Median AQI 432013: Median AQI 502014: Median AQI 522015: Median AQI 472016: Median AQI 412017: Median AQI 392018: Median AQI 392019: Median AQI 392020: Median AQI 412021: Median AQI 402022: Median AQI 402023: Median AQI 402024: Median AQI 382025: Median AQI 381980198519901995200020052010201520202025
  • 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
Ozone27575%
Fine particles (PM2.5)9025%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253653095420003854150Ozone
20243663065910003856122Ozone
20233652768900004059100Ozone
20223652927120004055122Ozone
20213652857640004058147Ozone
2020366296700000415690Ozone
20193653194510003952112Ozone
20183653095330003955115Ozone
20173653105320003955112Ozone
20163662897520004158122Ozone
201536520216120004764126PM2.5
201436515720440005264112PM2.5
201336519017230005067119PM2.5
201236625510650004364143Ozone
201136521914321004666151Ozone
20103632817831003962155Ozone
20093062624130003357143Ozone
20083602985660003361143Ozone
20073602876454003259179Ozone
200636329657100003463126Ozone
20053652837390003461140Ozone
20043612985661003659182Ozone
200336328469100003870136Ozone
2002365278611510103880205Ozone
200136528264117103871201Ozone
20003643006130003458136Ozone
199935128151144103469206Ozone
19983643024994003364187Ozone
19973573103086303558217NO2
199636129947105003567161Ozone
19953583222295003151200Ozone
199435830136128103471214Ozone
199335931724117003161187NO2
199236332322134103154202Ozone
199133427639113503571232Ozone
199029024130163003771200Ozone
19892391873587203887224Ozone
19882361782312176037143248Ozone
1987224166341572038101234Ozone
19862952751055002946187Ozone
19853623312164002748185Ozone
198434834530000213984Ozone
198336131033125103167201Ozone
19823513212053202947225Ozone
19813142941135102645203Ozone
198033026742126303679215Ozone

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 New Hampshire with a similar median AQI in 2025

All monitored counties in New Hampshire

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem