EnviroNearby

Greenlee County, Arizona air quality history

Daily Air Quality Index summaries from EPA monitors in Greenlee, Arizona, 1980–1984.

91%
Good days in 1983
37
Median daily AQI, 1983
0
Days above 100 in 1983
320
Days with an AQI in 1983 (of 365)

In 1983, EPA reported a daily Air Quality Index (AQI) for Greenlee, Arizona on 320 days. 291 of those days (91%) were in the Good range, and the median daily AQI was 37. That median is higher than the typical monitored county in Arizona (median 21 across 8 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 320 days.

The most recent year with data for this county is 1984; EPA's files for 1985–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1984) 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 195 of 344 days1980: Moderate 119 of 344 days1980: Unhealthy for Sensitive Groups 30 of 344 days19801981: Good 336 of 344 days1981: Moderate 8 of 344 days19811982: Good 276 of 326 days1982: Moderate 50 of 326 days19821983: Good 291 of 320 days1983: Moderate 29 of 320 days19831984: Good 8 of 8 days1984
  • 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 year0501001980: 90th percentile AQI 1001981: 90th percentile AQI 441982: 90th percentile AQI 511983: 90th percentile AQI 491984: 90th percentile AQI 331980: Median AQI 471981: Median AQI 341982: Median AQI 421983: Median AQI 371984: Median AQI 3119801981198219831984
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 1983

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
Ozone320100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
19848800000313333Ozone
1983320291290000374987Ozone
19823262765000004251100Ozone
198134433680000344467Ozone
19803441951193000047100143Ozone

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 Arizona

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–1984 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem