EnviroNearby

Hocking County, Ohio air quality history

Daily Air Quality Index summaries from EPA monitors in Hocking, Ohio, 1980–1982.

80%
Good days in 1982
34
Median daily AQI, 1982
23
Days above 100 in 1982
253
Days with an AQI in 1982 (of 365)

In 1982, EPA reported a daily Air Quality Index (AQI) for Hocking, Ohio on 253 days. 203 of those days (80%) were in the Good range, and the median daily AQI was 34. That median is lower than the typical monitored county in Ohio (median 39 across 23 counties), and lower than the typical monitored U.S. county (39). The main pollutant was ozone on 253 days.

EPA did not report an AQI for every day of 1982 here (253 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 1982; EPA's files for 1983–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1980) 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 29 of 61 days1980: Moderate 22 of 61 days1980: Unhealthy for Sensitive Groups 10 of 61 days19801981: Good 247 of 309 days1981: Moderate 49 of 309 days1981: Unhealthy for Sensitive Groups 11 of 309 days1981: Unhealthy 2 of 309 days19811982: Good 203 of 253 days1982: Moderate 27 of 253 days1982: Unhealthy for Sensitive Groups 22 of 253 days1982: Unhealthy 1 of 253 days1982
  • 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 1081981: 90th percentile AQI 771982: 90th percentile AQI 901980: Median AQI 511981: Median AQI 331982: Median AQI 34198019811982
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 1982

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
Ozone253100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
198225320327221003490151Ozone
198130924749112003377161Ozone
19806129221000051108133Ozone

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 1980–1982 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem