EnviroNearby

Crawford County, Ohio air quality history

Daily Air Quality Index summaries from EPA monitors in Crawford, Ohio, 1990–2010.

82%
Good days in 2010
41
Median daily AQI, 2010
1
Days above 100 in 2010
280
Days with an AQI in 2010 (of 365)

In 2010, EPA reported a daily Air Quality Index (AQI) for Crawford, Ohio on 280 days. 231 of those days (82%) were in the Good range, and the median daily AQI was 41. That median is lower than the typical monitored county in Ohio (median 50.5 across 38 counties), and lower than the typical monitored U.S. county (44). The main pollutant was ozone on 280 days. Across the years with fuller monitoring, the share of Good days rose: an average of 74% in 1990–1992 versus 85% in 2008–2010.

EPA did not report an AQI for every day of 2010 here (280 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 2010; EPA's files for 2011–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1996) 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%1990: Good 247 of 329 days1990: Moderate 55 of 329 days1990: Unhealthy for Sensitive Groups 24 of 329 days1990: Unhealthy 3 of 329 days19901991: Good 241 of 354 days1991: Moderate 62 of 354 days1991: Unhealthy for Sensitive Groups 29 of 354 days1991: Unhealthy 22 of 354 days1992: Good 283 of 361 days1992: Moderate 53 of 361 days1992: Unhealthy for Sensitive Groups 18 of 361 days1992: Unhealthy 7 of 361 days19921993: Good 274 of 353 days1993: Moderate 57 of 353 days1993: Unhealthy for Sensitive Groups 18 of 353 days1993: Unhealthy 4 of 353 days1994: Good 243 of 333 days1994: Moderate 59 of 333 days1994: Unhealthy for Sensitive Groups 27 of 333 days1994: Unhealthy 4 of 333 days19941995: Good 191 of 270 days1995: Moderate 50 of 270 days1995: Unhealthy for Sensitive Groups 24 of 270 days1995: Unhealthy 5 of 270 days1996: Good 87 of 91 days1996: Moderate 3 of 91 days1996: Unhealthy for Sensitive Groups 1 of 91 days19961997: Good 283 of 363 days1997: Moderate 57 of 363 days1997: Unhealthy for Sensitive Groups 18 of 363 days1997: Unhealthy 5 of 363 days1998: Good 247 of 364 days1998: Moderate 79 of 364 days1998: Unhealthy for Sensitive Groups 30 of 364 days1998: Unhealthy 8 of 364 days19981999: Good 261 of 361 days1999: Moderate 68 of 361 days1999: Unhealthy for Sensitive Groups 27 of 361 days1999: Unhealthy 5 of 361 days2000: Good 282 of 347 days2000: Moderate 56 of 347 days2000: Unhealthy for Sensitive Groups 8 of 347 days2000: Unhealthy 1 of 347 days20002001: Good 271 of 363 days2001: Moderate 59 of 363 days2001: Unhealthy for Sensitive Groups 29 of 363 days2001: Unhealthy 4 of 363 days2002: Good 266 of 363 days2002: Moderate 53 of 363 days2002: Unhealthy for Sensitive Groups 26 of 363 days2002: Unhealthy 18 of 363 days20022003: Good 281 of 359 days2003: Moderate 66 of 359 days2003: Unhealthy for Sensitive Groups 8 of 359 days2003: Unhealthy 4 of 359 days2004: Good 310 of 360 days2004: Moderate 43 of 360 days2004: Unhealthy for Sensitive Groups 7 of 360 days20042005: Good 266 of 342 days2005: Moderate 53 of 342 days2005: Unhealthy for Sensitive Groups 23 of 342 days2006: Good 286 of 345 days2006: Moderate 52 of 345 days2006: Unhealthy for Sensitive Groups 7 of 345 days20062007: Good 272 of 323 days2007: Moderate 42 of 323 days2007: Unhealthy for Sensitive Groups 9 of 323 days2008: Good 288 of 350 days2008: Moderate 60 of 350 days2008: Unhealthy for Sensitive Groups 2 of 350 days20082009: Good 321 of 355 days2009: Moderate 33 of 355 days2009: Unhealthy for Sensitive Groups 1 of 355 days2010: Good 231 of 280 days2010: Moderate 48 of 280 days2010: Unhealthy for Sensitive Groups 1 of 280 days2010
  • 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 year0501001501990: 90th percentile AQI 931991: 90th percentile AQI 1221992: 90th percentile AQI 801993: 90th percentile AQI 871994: 90th percentile AQI 971995: 90th percentile AQI 1011996: 90th percentile AQI 361997: 90th percentile AQI 901998: 90th percentile AQI 1011999: 90th percentile AQI 972000: 90th percentile AQI 742001: 90th percentile AQI 972002: 90th percentile AQI 1052003: 90th percentile AQI 712004: 90th percentile AQI 612005: 90th percentile AQI 802006: 90th percentile AQI 642007: 90th percentile AQI 672008: 90th percentile AQI 642009: 90th percentile AQI 502010: 90th percentile AQI 641990: Median AQI 381991: Median AQI 361992: Median AQI 371993: Median AQI 381994: Median AQI 371995: Median AQI 411996: Median AQI 221997: Median AQI 351998: Median AQI 391999: Median AQI 392000: Median AQI 362001: Median AQI 382002: Median AQI 362003: Median AQI 362004: Median AQI 342005: Median AQI 362006: Median AQI 362007: Median AQI 352008: Median AQI 362009: Median AQI 342010: Median AQI 4119901992199419961998200020022004200620082010
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2010

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
Ozone280100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20102802314810004164112Ozone
20093553213310003450101Ozone
20083502886020003664115Ozone
20073232724290003567122Ozone
20063452865270003664147Ozone
200534226653230003680147Ozone
20043603104370003461147Ozone
20033592816684003671195Ozone
20023632665326180036105182Ozone
200136327159294003897161Ozone
20003472825681003674195Ozone
199936126168275003997182Ozone
1998364247793080039101200Ozone
199736328357185003590156Ozone
19969187310002236105Ozone
1995270191502450041101190Ozone
199433324359274003797174Ozone
199335327457184003887169Ozone
199236128353187003780174Ozone
19913542416229220036122197Ozone
199032924755243003893169Ozone

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 Ohio

Source: U.S. EPA AirData, “Annual AQI by County” files for 1990–2010 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem