Idaho, Idaho Air Quality
Idaho County, Idaho (ID)
↑ Worseningover 9 years
How Idaho, Idaho Air Quality Compares
Idaho, Idaho's median AQI of 44is 7% worse than the national average of 41. Air quality has worsened by 17 AQI points over the past decade. The area averages 7 unhealthy air days per year. The primary pollutant of concern is Fine Particulate Matter (PM2.5).
Idaho, Idaho Air Quality: The Full Picture
Idaho, Idaho (Idaho County) holds an AirHistory Air Quality Grade of C (fair, scoring 52 out of 100), built from 9 years of EPA Air Quality System monitoring. Its median AQI rose 17 points between 2015 (27) and 2023 (44), and the five-year median now sits at 42 — inside the "Good" band on the EPA scale.
The pollutant driving most of the area's AQI readings is Fine Particulate Matter (PM2.5). In 2023, it set the daily AQI on 222 of 365 monitored days (61% of the year), making it the controlling pollutant for the C grade. The single worst reading logged that year hit an AQI of 98 (Moderate), while the 90th-percentile day — the level the dirtiest 10% of days reach — came in at 62.
In 2023, Idaho County recorded 233 "Good" air days (64% of the 365 days with valid AQI data), 132 "Moderate" days, and 0 days at "Unhealthy for Sensitive Groups" or above. Over the most recent five years on record, monitors logged 35 days that crossed into "Unhealthy for Sensitive Groups" or worse — about 7 per year.
The decade-long trend is worsening: median AQI has been climbing by roughly 1.12 points per year. The cleanest year in the record was 2015 (median AQI 27), and the most polluted was 2017 (median AQI 44). Because the data come straight from federally certified EPA monitors, these figures track the Idaho county the monitors physically sit in rather than a city boundary.
Get Idaho, Idaho's next air-quality update
Subscribe for Idaho, Idaho air-quality updates by email. No spam, unsubscribe anytime.
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). Air quality in this area has been declining over the past decade.
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 44 | 62 | 98 | 233 | 132 | 0 | PM2.5 |
| 2022 | 41 | 64 | 263 | 242 | 113 | 10 | PM2.5 |
| 2021 | 42 | 77 | 188 | 237 | 112 | 16 | Ozone |
| 2020 | 40 | 64 | 209 | 244 | 113 | 9 | PM2.5 |
| 2019 | 44 | 60 | 89 | 236 | 129 | 0 | PM2.5 |
| 2018 | 43 | 64 | 134 | 248 | 115 | 2 | PM2.5 |
| 2017 | 44 | 67 | 304 | 236 | 112 | 17 | PM2.5 |
| 2016 | 39 | 58 | 82 | 268 | 98 | 0 | PM2.5 |
| 2015 | 27 | 64 | 251 | 205 | 56 | 8 | PM2.5 |
What This Means for Idaho County Residents
Idaho, Idaho has received an Air Quality Grade of C (52/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 44 falls in the "Good" range.
Concerning trends show air quality has been declining, with the median AQI rising by 17 points over the monitoring period. This could be driven by increased development, wildfire smoke, or industrial activity.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 7 unhealthy air quality days per year, days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity. The American Lung Association's State of the Air report provides additional context on long-term health risks from air pollution exposure.
Related Cities in Idaho
Frequently Asked Questions
Idaho, Idaho has a current median AQI of 44, which falls in the "Good" range. The area has received an Air Quality Grade of C (52/100) based on 10 years of EPA monitoring data.
Air quality in Idaho, Idaho is worsening over the past decade. The median AQI has changed by +17 points from 2015 to 2023.
Idaho, Idaho averages 7 unhealthy air quality days per year over the past 5 years. On these days, sensitive groups including children, the elderly, and those with respiratory conditions should limit outdoor activity.
The primary pollutant affecting Idaho, Idaho is Fine Particulate Matter (PM2.5). This is the dominant contributor to elevated AQI readings in the Idaho County area.
Idaho, Idaho averages 7 unhealthy air days per year. Asthma patients should monitor daily AQI readings and limit outdoor activity when AQI exceeds 100. The primary pollutant is Fine Particulate Matter (PM2.5), which is a known asthma trigger.
With a median AQI of 44 (Good), outdoor exercise in Idaho, Idaho is generally safe year-round. Idaho, Idaho averages 7 days per year when athletes should move workouts indoors.