EnviroNearby

Lawrence County, Pennsylvania air quality history

Daily Air Quality Index summaries from EPA monitors in Lawrence, Pennsylvania, 1980–2024.

95%
Good days in 2023
34
Median daily AQI, 2023
1
Days above 100 in 2023
267
Days with an AQI in 2023 (of 365)

In 2023, EPA reported a daily Air Quality Index (AQI) for Lawrence, Pennsylvania on 267 days. 254 of those days (95%) were in the Good range, and the median daily AQI was 34. That median is lower than the typical monitored county in Pennsylvania (median 44 across 38 counties), and lower than the typical monitored U.S. county (43). The main pollutant was ozone on 267 days. Across the years with fuller monitoring, the share of Good days rose: an average of 63% in 1980–1982 versus 93% in 2021–2023.

EPA did not report an AQI for every day of 2023 here (267 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.

The most recent year with data for this county is 2024; EPA's files for 2025–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (2024) 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%1980: Good 213 of 331 days1980: Moderate 101 of 331 days1980: Unhealthy for Sensitive Groups 15 of 331 days1980: Unhealthy 2 of 331 days19801981: Good 174 of 347 days1981: Moderate 136 of 347 days1981: Unhealthy for Sensitive Groups 29 of 347 days1981: Unhealthy 7 of 347 days1981: Very Unhealthy 1 of 347 days1982: Good 270 of 357 days1982: Moderate 69 of 357 days1982: Unhealthy for Sensitive Groups 11 of 357 days1982: Unhealthy 7 of 357 days1983: Good 290 of 364 days1983: Moderate 58 of 364 days1983: Unhealthy for Sensitive Groups 12 of 364 days1983: Unhealthy 4 of 364 days1984: Good 299 of 366 days1984: Moderate 60 of 366 days1984: Unhealthy for Sensitive Groups 7 of 366 days1985: Good 274 of 364 days1985: Moderate 75 of 364 days1985: Unhealthy for Sensitive Groups 12 of 364 days1985: Unhealthy 3 of 364 days19851986: Good 276 of 364 days1986: Moderate 81 of 364 days1986: Unhealthy for Sensitive Groups 7 of 364 days1987: Good 267 of 363 days1987: Moderate 72 of 363 days1987: Unhealthy for Sensitive Groups 18 of 363 days1987: Unhealthy 6 of 363 days1988: Good 263 of 366 days1988: Moderate 66 of 366 days1988: Unhealthy for Sensitive Groups 14 of 366 days1988: Unhealthy 18 of 366 days1988: Very Unhealthy 5 of 366 days1989: Good 291 of 365 days1989: Moderate 58 of 365 days1989: Unhealthy for Sensitive Groups 13 of 365 days1989: Unhealthy 3 of 365 days1990: Good 309 of 363 days1990: Moderate 43 of 363 days1990: Unhealthy for Sensitive Groups 10 of 363 days1990: Unhealthy 1 of 363 days19901991: Good 277 of 365 days1991: Moderate 67 of 365 days1991: Unhealthy for Sensitive Groups 19 of 365 days1991: Unhealthy 2 of 365 days1992: Good 316 of 366 days1992: Moderate 45 of 366 days1992: Unhealthy for Sensitive Groups 4 of 366 days1992: Unhealthy 1 of 366 days1993: Good 297 of 365 days1993: Moderate 55 of 365 days1993: Unhealthy for Sensitive Groups 12 of 365 days1993: Very Unhealthy 1 of 365 days1994: Good 294 of 365 days1994: Moderate 63 of 365 days1994: Unhealthy for Sensitive Groups 6 of 365 days1994: Unhealthy 2 of 365 days1995: Good 272 of 364 days1995: Moderate 76 of 364 days1995: Unhealthy for Sensitive Groups 13 of 364 days1995: Unhealthy 3 of 364 days19951996: Good 256 of 366 days1996: Moderate 78 of 366 days1996: Unhealthy for Sensitive Groups 29 of 366 days1996: Unhealthy 3 of 366 days1997: Good 281 of 365 days1997: Moderate 71 of 365 days1997: Unhealthy for Sensitive Groups 9 of 365 days1997: Unhealthy 4 of 365 days1998: Good 295 of 365 days1998: Moderate 59 of 365 days1998: Unhealthy for Sensitive Groups 9 of 365 days1998: Unhealthy 2 of 365 days1999: Good 281 of 365 days1999: Moderate 60 of 365 days1999: Unhealthy for Sensitive Groups 20 of 365 days1999: Unhealthy 3 of 365 days1999: Very Unhealthy 1 of 365 days2000: Good 324 of 366 days2000: Moderate 39 of 366 days2000: Unhealthy for Sensitive Groups 3 of 366 days20002001: Good 287 of 365 days2001: Moderate 68 of 365 days2001: Unhealthy for Sensitive Groups 9 of 365 days2001: Unhealthy 1 of 365 days2002: Good 293 of 365 days2002: Moderate 45 of 365 days2002: Unhealthy for Sensitive Groups 22 of 365 days2002: Unhealthy 5 of 365 days2003: Good 315 of 365 days2003: Moderate 44 of 365 days2003: Unhealthy for Sensitive Groups 5 of 365 days2003: Very Unhealthy 1 of 365 days2004: Good 328 of 366 days2004: Moderate 36 of 366 days2004: Unhealthy for Sensitive Groups 2 of 366 days2005: Good 288 of 365 days2005: Moderate 65 of 365 days2005: Unhealthy for Sensitive Groups 11 of 365 days2005: Unhealthy 1 of 365 days20052006: Good 321 of 365 days2006: Moderate 41 of 365 days2006: Unhealthy for Sensitive Groups 3 of 365 days2007: Good 297 of 365 days2007: Moderate 57 of 365 days2007: Unhealthy for Sensitive Groups 11 of 365 days2008: Good 302 of 366 days2008: Moderate 61 of 366 days2008: Unhealthy for Sensitive Groups 3 of 366 days2009: Good 344 of 365 days2009: Moderate 20 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 309 of 365 days2010: Moderate 53 of 365 days2010: Unhealthy for Sensitive Groups 2 of 365 days2010: Unhealthy 1 of 365 days20102011: Good 310 of 365 days2011: Moderate 51 of 365 days2011: Unhealthy for Sensitive Groups 4 of 365 days2012: Good 306 of 366 days2012: Moderate 50 of 366 days2012: Unhealthy for Sensitive Groups 9 of 366 days2012: Unhealthy 1 of 366 days2013: Good 339 of 365 days2013: Moderate 23 of 365 days2013: Unhealthy for Sensitive Groups 3 of 365 days2014: Good 337 of 365 days2014: Moderate 26 of 365 days2014: Unhealthy for Sensitive Groups 2 of 365 days2015: Good 332 of 365 days2015: Moderate 32 of 365 days2015: Unhealthy for Sensitive Groups 1 of 365 days20152016: Good 326 of 355 days2016: Moderate 28 of 355 days2016: Unhealthy for Sensitive Groups 1 of 355 days2017: Good 331 of 364 days2017: Moderate 33 of 364 days2018: Good 329 of 358 days2018: Moderate 29 of 358 days2019: Good 356 of 361 days2019: Moderate 5 of 361 days2020: Good 354 of 363 days2020: Moderate 9 of 363 days20202021: Good 259 of 278 days2021: Moderate 19 of 278 days2022: Good 223 of 243 days2022: Moderate 18 of 243 days2022: Unhealthy for Sensitive Groups 2 of 243 days2023: Good 254 of 267 days2023: Moderate 12 of 267 days2023: Unhealthy for Sensitive Groups 1 of 267 days2024: Good 31 of 31 days2024
  • 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 841981: 90th percentile AQI 1021982: 90th percentile AQI 741983: 90th percentile AQI 711984: 90th percentile AQI 611985: 90th percentile AQI 671986: 90th percentile AQI 651987: 90th percentile AQI 801988: 90th percentile AQI 1011989: 90th percentile AQI 631990: 90th percentile AQI 641991: 90th percentile AQI 801992: 90th percentile AQI 541993: 90th percentile AQI 641994: 90th percentile AQI 641995: 90th percentile AQI 711996: 90th percentile AQI 971997: 90th percentile AQI 671998: 90th percentile AQI 691999: 90th percentile AQI 842000: 90th percentile AQI 522001: 90th percentile AQI 642002: 90th percentile AQI 772003: 90th percentile AQI 542004: 90th percentile AQI 512005: 90th percentile AQI 772006: 90th percentile AQI 532007: 90th percentile AQI 622008: 90th percentile AQI 552009: 90th percentile AQI 472010: 90th percentile AQI 582011: 90th percentile AQI 582012: 90th percentile AQI 672013: 90th percentile AQI 492014: 90th percentile AQI 492015: 90th percentile AQI 492016: 90th percentile AQI 492017: 90th percentile AQI 492018: 90th percentile AQI 502019: 90th percentile AQI 432020: 90th percentile AQI 432021: 90th percentile AQI 472022: 90th percentile AQI 482023: 90th percentile AQI 482024: 90th percentile AQI 291980: Median AQI 431981: Median AQI 501982: Median AQI 391983: Median AQI 371984: Median AQI 381985: Median AQI 401986: Median AQI 401987: Median AQI 401988: Median AQI 411989: Median AQI 361990: Median AQI 361991: Median AQI 371992: Median AQI 361993: Median AQI 381994: Median AQI 401995: Median AQI 381996: Median AQI 401997: Median AQI 391998: Median AQI 361999: Median AQI 392000: Median AQI 372001: Median AQI 352002: Median AQI 352003: Median AQI 352004: Median AQI 332005: Median AQI 392006: Median AQI 352007: Median AQI 352008: Median AQI 352009: Median AQI 292010: Median AQI 332011: Median AQI 332012: Median AQI 342013: Median AQI 342014: Median AQI 352015: Median AQI 332016: Median AQI 332017: Median AQI 342018: Median AQI 322019: Median AQI 312020: Median AQI 312021: Median AQI 312022: Median AQI 372023: Median AQI 342024: Median AQI 241980198519901995200020052010201520202024
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2023

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
Ozone267100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2024313100000242931Ozone
20232672541210003448119Ozone
20222432231820003748126Ozone
2021278259190000314787Ozone
202036335490000314393Ozone
201936135650000314374Ozone
2018358329290000325097Ozone
2017364331330000344990Ozone
20163553262810003349112Ozone
20153653323210003349101Ozone
20143653372620003549119Ozone
20133653392330003449136Ozone
20123663065091003467154Ozone
20113653105140003358129Ozone
20103653095321003358156Ozone
20093653442010002947101Ozone
20083663026130003555143Ozone
200736529757110003562119Ozone
20063653214130003553129Ozone
200536528865111003977154NO2
20043663283620003351126NO2
20033653154450103554218Ozone
200236529345225003577179Ozone
20013652876891003564166Ozone
20003663243930003752115NO2
199936528160203103984202NO2
19983652955992003669172Ozone
19973652817194003967174NO2
199636625678293004097174Ozone
199536427276133003871187NO2
19943652946362004064159NO2
199336529755120103864231NO2
19923663164541003654151NO2
199136527767192003780166NO2
199036330943101003664164NO2
198936529158133003663169Ozone
19883662636614185041101221NO2
198736326772186004080174NO2
19863642768170004065150NO2
198536427475123004067164NO2
19843662996070003861122NO2
198336429058124003771195NO2
198235727069117003974172NO2
19813471741362971050102209NO2
1980331213101152004384169NO2

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 Pennsylvania

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2024 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem