Coeur d'Alene, ID

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Metro area air quality from EPA Air Quality System (2024). 355 days monitored. Median AQI: 24 (Good).

Insights: Coeur d'Alene, ID metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 24 over 355 measured days in 2024, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 291 Good days (82%), 63 Moderate (18%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 57 while the highest single-day reading hit 109 (USG). Metro residents averaged roughly 24.6 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by +3 and the median AQI moved -2 points, which classifies the multi-year trajectory as stable. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Aberdeen, SD (85.7% good, AQI 24); Juneau, AK (85.4% good, AQI 24); New Castle, PA (100.0% good, AQI 24).

Air Quality Summary

Median AQI

24

Good

Good Days

82.0%

291 of 355 days

Max AQI

109

USG

Health Grade

Good

90th pct: 57

AQI Day Breakdown (2024)

Distribution of 355 monitored days across EPA AQI categories.

Good

291

82%

Moderate

63

18%

USG

1

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Coeur d'Alene, ID metro area's air quality is rated Good based on 82.0% good air days. No unhealthy air days were recorded in 2024.

Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.

5-Year Air Quality Trend

Air quality is stable in the Coeur d'Alene, ID metro. Best year: 2024 (291 good days).

Year Good Moderate Unhealthy Median AQI
2020 288 58 2 26
2021 268 81 5 31
2022 264 88 3 29
2023 279 78 1 32
2024 291 63 0 24

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Coeur d'Alene, ID.

Aberdeen, SD

AQI 24 · 85.7% good

24

Juneau, AK

AQI 24 · 85.4% good

24

New Castle, PA

AQI 24 · 100.0% good

24

Prineville, OR

AQI 24 · 77.0% good

24

Albany, OR

AQI 25 · 87.4% good

25

Elko, NV

AQI 23 · 87.1% good

23

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Air Quality Guides

Learn more about air quality monitoring, pollutants, and health impacts.

Understanding AQI

What each AQI level means and who is most at risk.

Best & Worst City Air Quality

Metro area air quality rankings and what drives urban pollution.

Health Effects of Air Pollution

How PM2.5 and ozone exposure affects respiratory and cardiovascular health.

Frequently Asked Questions

What is the air quality in the Coeur d'Alene, ID metro area? ▼
The Coeur d'Alene, ID metro area has a median Air Quality Index (AQI) of 24, rated "Good." 82.0% of monitored days (291 out of 355) had good air quality in 2024.
How many unhealthy air days does Coeur d'Alene, ID have? ▼
In 2024, the Coeur d'Alene, ID metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 109.
Is air quality in Coeur d'Alene, ID getting better or worse? ▼
Air quality in the Coeur d'Alene, ID metro is stable based on 5-year trends (2020-2024). Best year: 2024 with 291 good days. Worst year: 2022 with 264 good days.
What does AQI 24 mean for health? ▼
An AQI of 24 is "Good" — air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
What is the 90th percentile AQI for Coeur d'Alene, ID? ▼
The 90th percentile AQI for the Coeur d'Alene, ID metro area is 57, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 109 (USG).
How does Coeur d'Alene, ID compare to other metro areas? ▼
The Coeur d'Alene, ID metro has 82.0% good air days. Similar metros: Aberdeen, SD (85.7% good), Juneau, AK (85.4% good), New Castle, PA (100.0% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2024. The AQS collects ambient air monitoring data from state, local, and tribal monitoring agencies across the United States.

Metrics: Air Quality Index (AQI) is calculated using EPA-standard breakpoints for six criteria pollutants: PM2.5, PM10, Ozone, NO2, CO, and SO2. Median AQI, max AQI, and 90th percentile AQI are computed from daily measurements. Good days percentage reflects days with AQI 0–50.

Coverage: 501 metro areas (Core Based Statistical Areas). Only metros with active monitoring stations are included. Unmonitored areas are not represented.

Read our methodology — how this data is sourced, computed, and verified.

Source: U.S. EPA — AirNow / AQS Air Quality Index readings and pollutant concentrations · 2025