Metro area air quality · 2025
Madera, CA
Median AQI 50 (Good). 50.4% of monitored days rated Good across this metro's EPA monitoring network.
- 50
- Median AQI
- 50.4%
- Good-air days
- 0
- Unhealthy days
- 12%
- Cleaner than US metros
Madera, CA posted a 2025 median AQI of 50 (Good) with 50.4% Good days
According to the U.S. EPA Air Quality System, the Madera, CA CBSA recorded a median AQI of 50 across 365 monitored days in 2025, with 50.4% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US metros
- The Madera, CA CBSA's 50.4% Good-day share places it cleaner than 12% of US metros in 2025.
- Closest median-AQI peer
- Fort Collins, CO (50.7% Good, median AQI 50) is the closest nationwide median-AQI peer to Madera, CA.
- 2020–2025 Good-day shift
- Madera, CA's Good-day share moved +19.1 points from 2020 to 2025 (median AQI -14).
- Median AQI
- Median AQI: 50
Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →
The verdict
Madera, CA lands in the lower Good-day tercile (50.4% Good), a thinner clean-air share than most CBSA peers here. On the EPA scale the metro runs good, among the more polluted US metros, with a median AQI of 50 and 50.4% of 365 monitored days in the Good band.
- 50
- median AQI · Good
- 50.4%
- days rated Good
- 12%
- cleaner than US metros
- 136
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- Madera, CA metro's Good-day share rose from 47.8% to 50.8% between the 2024 and 2025 EPA annual releases, a change of +3.0 percentage points.
Madera, CA lands in the lower Good-day tercile (50.4% Good), a thinner clean-air share than most CBSA peers here. Signature read: 50.4% Good-day share (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 50 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 184 Good (50%), 178 Moderate (49%), and 3 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 76; the highest single-day reading hit 136 (USG).
Across 2020–2025, Good-day share shifted +19.1 points and median AQI moved -14 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Fort Collins, CO (50.7% good, AQI 50); Merced, CA (51.0% good, AQI 50); Nashville-Davidson--Murfreesboro--Franklin, TN (51.2% good, AQI 50).
Air Quality Summary
Median AQI
50
Good
Good Days
50.4%
184 of 365 days
Max AQI
136
USG
Health Grade
Moderate
90th pct: 76
AQI Day Breakdown (2025)
Distribution of 365 monitored days across EPA AQI categories.
Good
184
50%
Moderate
178
49%
USG
3
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Madera, CA metro area's air quality is rated Moderate based on 50.4% good air days. No unhealthy air days were recorded in 2025.
Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.
How does the Madera, CA metro compare?
How Madera, CA compares
5-Year Air Quality Trend
Air quality is improving in the Madera, CA metro. Highest Good-day share: 2025 (50.8%, 184 of 362 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 104 | 209 | 15 | 64 | 275 |
| 2021 | 133 | 197 | 7 | 58 | 194 |
| 2022 | 147 | 205 | 0 | 54 | 136 |
| 2023 | 162 | 188 | 1 | 52 | 151 |
| 2024 | 163 | 178 | 0 | 52 | 140 |
| 2025 | 184 | 178 | 0 | 50 | 136 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Madera, CA (50).
Fort Collins, CO
Median AQI 50 · 50.7% Good-day share
Merced, CA
Median AQI 50 · 51.0% Good-day share
Nashville-Davidson--Murfreesboro--Franklin, TN
Median AQI 50 · 51.2% Good-day share
Oxnard-Thousand Oaks-Ventura, CA
Median AQI 50 · 52.0% Good-day share
Reno, NV
Median AQI 50 · 50.1% Good-day share
San Luis Obispo-Paso Robles-Arroyo Grande, CA
Median AQI 50 · 52.3% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Madera, CA's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
Aberdeen, WA
0 unhealthy-or-worse days · median AQI 22
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Frequently Asked Questions
How many unhealthy air days does Madera, CA have? ▼
What is the air quality in the Madera, CA metro area? ▼
Is air quality in Madera, CA getting better or worse? ▼
What does AQI 50 mean for health? ▼
How does Madera, CA compare to other metro areas? ▼
What is the 90th percentile AQI for Madera, CA? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Madera, CA, 2025. See our methodology for how AQI, median, and coverage figures are computed.
Read our methodology , how this data is sourced, computed, and verified.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary, Madera, CA · 2020–2025