EnviroNearby

Cochise County, Arizona air quality history

Daily Air Quality Index summaries from EPA monitors in Cochise, Arizona, 1980–2025.

70%
Good days in 2025
45
Median daily AQI, 2025
4
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 Cochise, Arizona on 365 days. 255 of those days (70%) were in the Good range, and the median daily AQI was 45. That median is about the same as the typical monitored county in Arizona (median 47 across 13 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 312 days. Across the years with fuller monitoring, the share of Good days fell: an average of 87% in 1980–1982 versus 69% in 2023–2025.

Years with fewer than 120 monitored days (1986, 1987) 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 166 of 215 days1980: Moderate 30 of 215 days1980: Unhealthy for Sensitive Groups 18 of 215 days1980: Unhealthy 1 of 215 days19801981: Good 264 of 301 days1981: Moderate 37 of 301 days1982: Good 252 of 265 days1982: Moderate 13 of 265 days1983: Good 262 of 281 days1983: Moderate 19 of 281 days1984: Good 277 of 301 days1984: Moderate 19 of 301 days1984: Unhealthy for Sensitive Groups 5 of 301 days1985: Good 281 of 331 days1985: Moderate 41 of 331 days1985: Unhealthy for Sensitive Groups 8 of 331 days1985: Unhealthy 1 of 331 days19851986: Good 12 of 54 days1986: Moderate 33 of 54 days1986: Unhealthy for Sensitive Groups 7 of 54 days1986: Unhealthy 2 of 54 days1987: Good 31 of 61 days1987: Moderate 26 of 61 days1987: Unhealthy for Sensitive Groups 4 of 61 days1988: Good 87 of 131 days1988: Moderate 40 of 131 days1988: Unhealthy for Sensitive Groups 2 of 131 days1988: Unhealthy 2 of 131 days1989: Good 155 of 240 days1989: Moderate 74 of 240 days1989: Unhealthy for Sensitive Groups 8 of 240 days1989: Unhealthy 3 of 240 days1990: Good 242 of 353 days1990: Moderate 99 of 353 days1990: Unhealthy for Sensitive Groups 11 of 353 days1990: Unhealthy 1 of 353 days19901991: Good 233 of 338 days1991: Moderate 99 of 338 days1991: Unhealthy for Sensitive Groups 6 of 338 days1992: Good 273 of 351 days1992: Moderate 78 of 351 days1993: Good 253 of 348 days1993: Moderate 94 of 348 days1993: Unhealthy for Sensitive Groups 1 of 348 days1994: Good 225 of 356 days1994: Moderate 127 of 356 days1994: Unhealthy for Sensitive Groups 4 of 356 days1995: Good 216 of 305 days1995: Moderate 87 of 305 days1995: Unhealthy for Sensitive Groups 2 of 305 days19951996: Good 233 of 342 days1996: Moderate 104 of 342 days1996: Unhealthy for Sensitive Groups 5 of 342 days1997: Good 274 of 347 days1997: Moderate 73 of 347 days1998: Good 226 of 350 days1998: Moderate 122 of 350 days1998: Unhealthy for Sensitive Groups 2 of 350 days1999: Good 229 of 355 days1999: Moderate 121 of 355 days1999: Unhealthy for Sensitive Groups 5 of 355 days2000: Good 222 of 354 days2000: Moderate 126 of 354 days2000: Unhealthy for Sensitive Groups 6 of 354 days20002001: Good 261 of 343 days2001: Moderate 82 of 343 days2002: Good 223 of 335 days2002: Moderate 107 of 335 days2002: Unhealthy for Sensitive Groups 5 of 335 days2003: Good 190 of 351 days2003: Moderate 154 of 351 days2003: Unhealthy for Sensitive Groups 7 of 351 days2004: Good 242 of 362 days2004: Moderate 117 of 362 days2004: Unhealthy for Sensitive Groups 3 of 362 days2005: Good 219 of 355 days2005: Moderate 132 of 355 days2005: Unhealthy for Sensitive Groups 4 of 355 days20052006: Good 230 of 360 days2006: Moderate 121 of 360 days2006: Unhealthy for Sensitive Groups 9 of 360 days2007: Good 226 of 357 days2007: Moderate 130 of 357 days2007: Unhealthy for Sensitive Groups 1 of 357 days2008: Good 228 of 363 days2008: Moderate 132 of 363 days2008: Unhealthy for Sensitive Groups 3 of 363 days2009: Good 249 of 363 days2009: Moderate 113 of 363 days2009: Unhealthy for Sensitive Groups 1 of 363 days2010: Good 244 of 363 days2010: Moderate 115 of 363 days2010: Unhealthy for Sensitive Groups 4 of 363 days20102011: Good 200 of 352 days2011: Moderate 141 of 352 days2011: Unhealthy for Sensitive Groups 11 of 352 days2012: Good 189 of 360 days2012: Moderate 162 of 360 days2012: Unhealthy for Sensitive Groups 9 of 360 days2013: Good 201 of 365 days2013: Moderate 157 of 365 days2013: Unhealthy for Sensitive Groups 7 of 365 days2014: Good 201 of 365 days2014: Moderate 159 of 365 days2014: Unhealthy for Sensitive Groups 5 of 365 days2015: Good 272 of 365 days2015: Moderate 93 of 365 days20152016: Good 278 of 366 days2016: Moderate 86 of 366 days2016: Unhealthy for Sensitive Groups 2 of 366 days2017: Good 248 of 365 days2017: Moderate 115 of 365 days2017: Unhealthy for Sensitive Groups 2 of 365 days2018: Good 266 of 365 days2018: Moderate 99 of 365 days2019: Good 253 of 365 days2019: Moderate 112 of 365 days2020: Good 271 of 366 days2020: Moderate 93 of 366 days2020: Unhealthy for Sensitive Groups 2 of 366 days20202021: Good 259 of 365 days2021: Moderate 104 of 365 days2021: Unhealthy for Sensitive Groups 2 of 365 days2022: Good 291 of 365 days2022: Moderate 73 of 365 days2022: Unhealthy for Sensitive Groups 1 of 365 days2023: Good 272 of 365 days2023: Moderate 90 of 365 days2023: Unhealthy for Sensitive Groups 3 of 365 days2024: Good 225 of 366 days2024: Moderate 128 of 366 days2024: Unhealthy for Sensitive Groups 11 of 366 days2024: Unhealthy 1 of 366 days2024: Hazardous 1 of 366 days2025: Good 255 of 365 days2025: Moderate 106 of 365 days2025: Unhealthy for Sensitive Groups 2 of 365 days2025: Unhealthy 1 of 365 days2025: Hazardous 1 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 931981: 90th percentile AQI 511982: 90th percentile AQI 461983: 90th percentile AQI 481984: 90th percentile AQI 481985: 90th percentile AQI 661986: 90th percentile AQI 1091987: 90th percentile AQI 871988: 90th percentile AQI 771989: 90th percentile AQI 801990: 90th percentile AQI 711991: 90th percentile AQI 741992: 90th percentile AQI 641993: 90th percentile AQI 641994: 90th percentile AQI 741995: 90th percentile AQI 711996: 90th percentile AQI 741997: 90th percentile AQI 611998: 90th percentile AQI 741999: 90th percentile AQI 742000: 90th percentile AQI 802001: 90th percentile AQI 642002: 90th percentile AQI 712003: 90th percentile AQI 802004: 90th percentile AQI 742005: 90th percentile AQI 772006: 90th percentile AQI 742007: 90th percentile AQI 712008: 90th percentile AQI 742009: 90th percentile AQI 642010: 90th percentile AQI 672011: 90th percentile AQI 802012: 90th percentile AQI 842013: 90th percentile AQI 772014: 90th percentile AQI 692015: 90th percentile AQI 642016: 90th percentile AQI 612017: 90th percentile AQI 712018: 90th percentile AQI 632019: 90th percentile AQI 642020: 90th percentile AQI 612021: 90th percentile AQI 602022: 90th percentile AQI 612023: 90th percentile AQI 642024: 90th percentile AQI 802025: 90th percentile AQI 711980: Median AQI 301981: Median AQI 341982: Median AQI 261983: Median AQI 31984: Median AQI 31985: Median AQI 341986: Median AQI 761987: Median AQI 501988: Median AQI 341989: Median AQI 441990: Median AQI 441991: Median AQI 451992: Median AQI 431993: Median AQI 441994: Median AQI 461995: Median AQI 451996: Median AQI 441997: Median AQI 441998: Median AQI 471999: Median AQI 472000: Median AQI 462001: Median AQI 442002: Median AQI 472003: Median AQI 492004: Median AQI 462005: Median AQI 472006: Median AQI 472007: Median AQI 462008: Median AQI 472009: Median AQI 462010: Median AQI 452011: Median AQI 482012: Median AQI 502013: Median AQI 492014: Median AQI 482015: Median AQI 442016: Median AQI 442017: Median AQI 452018: Median AQI 452019: Median AQI 462020: Median AQI 452021: Median AQI 452022: Median AQI 442023: Median AQI 442024: Median AQI 482025: Median AQI 451980198519901995200020052010201520202025
  • 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
Ozone31285%
Coarse particles (PM10)5014%
Fine particles (PM2.5)31%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536525510621014571328Ozone
2024366225128111014880307Ozone
20233652729030004464108Ozone
20223652917310004461101Ozone
202136525910420004560105Ozone
20203662719320004561108Ozone
20193652531120000466497Ozone
2018365266990000456390Ozone
201736524811520004571111Ozone
20163662788620004461141Ozone
2015365272930000446490Ozone
201436520115950004869137Ozone
201336520115770004977149Ozone
201236018916290005084120Ozone
2011352200141110004880119Ozone
201036324411540004567112Ozone
200936324911310004664129Ozone
200836322813230004774150Ozone
200735722613010004671108Ozone
200636023012190004774119Ozone
200535521913240004777108Ozone
200436224211730004674108Ozone
200335119015470004980126Ozone
200233522310750004771129Ozone
2001343261820000446493Ozone
200035422212660004680132Ozone
199935522912150004774129Ozone
199835022612220004774115Ozone
1997347274730000446193Ozone
199634223310450004474115Ozone
19953052168720004571112Ozone
199435622512740004674108Ozone
19933482539410004464105Ozone
1992351273780000436492Ozone
19913382339960004574147Ozone
199035324299111004471200Ozone
19892401557483004480175Ozone
1988131874022003477174PM2.5
198761312640005087133PM10
1986541233720076109200PM10
19853312814181003466158CO
1984301277195000348143CO
198328126219000034877CO
1982265252130000264684CO
1981301264370000345187CO
198021516630181003093156CO

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 Arizona with a similar median AQI in 2025

All monitored counties in Arizona

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