EnviroNearby

Elmore County, Idaho air quality history

Daily Air Quality Index summaries from EPA monitors in Elmore, Idaho, 2001–2005.

68%
Good days in 2005
47
Median daily AQI, 2005
0
Days above 100 in 2005
152
Days with an AQI in 2005 (of 365)

In 2005, EPA reported a daily Air Quality Index (AQI) for Elmore, Idaho on 152 days. 104 of those days (68%) were in the Good range, and the median daily AQI was 47. That median is higher than the typical monitored county in Idaho (median 38 across 18 counties), and higher than the typical monitored U.S. county (44). The main pollutant was ozone on 152 days.

EPA did not report an AQI for every day of 2005 here (152 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 2005; EPA's files for 2006–2025 contain no row for it, which usually means its monitors stopped reporting.

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%2001: Good 118 of 157 days2001: Moderate 36 of 157 days2001: Unhealthy for Sensitive Groups 3 of 157 days20012002: Good 206 of 302 days2002: Moderate 91 of 302 days2002: Unhealthy for Sensitive Groups 5 of 302 days20022003: Good 314 of 365 days2003: Moderate 50 of 365 days2003: Unhealthy for Sensitive Groups 1 of 365 days20032004: Good 221 of 274 days2004: Moderate 53 of 274 days20042005: Good 104 of 152 days2005: Moderate 48 of 152 days2005
  • 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 year0501002001: 90th percentile AQI 642002: 90th percentile AQI 742003: 90th percentile AQI 542004: 90th percentile AQI 582005: 90th percentile AQI 672001: Median AQI 462002: Median AQI 442003: Median AQI 382004: Median AQI 422005: Median AQI 4720012002200320042005
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2005

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
Ozone152100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2005152104480000476784Ozone
2004274221530000425880Ozone
20033653145010003854120Ozone
20023022069150004474132Ozone
20011571183630004664115Ozone

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 Idaho

Source: U.S. EPA AirData, “Annual AQI by County” files for 2001–2005 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem