Metro area air quality · 2025
Redding, CA
Median AQI 44 (Good). 75.6% of monitored days rated Good across this metro's EPA monitoring network.
- 44
- Median AQI
- 75.6%
- Good-air days
- 1
- Unhealthy days
- 57%
- Cleaner than US metros
Redding, CA posted a 2025 median AQI of 44 (Good) with 75.6% Good days
According to the U.S. EPA Air Quality System, the Redding, CA CBSA recorded a median AQI of 44 across 365 monitored days in 2025, with 75.6% rated Good and 1 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 Redding, CA CBSA's 75.6% Good-day share places it cleaner than 57% of US metros in 2025.
- Closest median-AQI peer
- Bartlesville, OK (68.0% Good, median AQI 44) is the closest nationwide median-AQI peer to Redding, CA.
- 2020–2025 Good-day shift
- Redding, CA's Good-day share moved -3.8 points from 2020 to 2025 (median AQI +3).
- Median AQI
- Median AQI: 44
Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →
The verdict
Redding, CA's peak reading 154 is in the upper max-AQI tercile among CBSA metros here. On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 44 and 75.6% of 365 monitored days in the Good band.
- 44
- median AQI · Good
- 75.6%
- days rated Good
- 57%
- cleaner than US metros
- 154
- worst single reading
1 day reached Unhealthy or worse across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- Redding, CA metro's peak single-day AQI fell from 232 to 154 between the 2024 and 2025 EPA annual releases, a change of -78 points.
- Redding, CA metro's Good-day share rose from 74.0% to 75.6% between the 2024 and 2025 EPA annual releases, a change of +1.6 percentage points.
- Redding, CA metro's Unhealthy-category days rose from 0 to 1 between the 2024 and 2025 EPA annual releases, a change of +1 days.
Redding, CA's peak reading 154 is in the upper max-AQI tercile among CBSA metros here. Signature read: peak AQI 154 (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 44 over 365 measured days in 2025 (Good / Good). The monitored-day split lands at 276 Good (76%), 88 Moderate (24%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 61; the highest single-day reading hit 154 (Unhealthy).
Across 2020–2025, Good-day share shifted -3.8 points and median AQI moved +3 (worsening). The annual record contains 1 day at Unhealthy or worse. Metros with comparable AQI profiles include Bartlesville, OK (68.0% good, AQI 44); Berlin, NH-VT (81.5% good, AQI 44); Bloomington, IL (66.0% good, AQI 44).
Air Quality Summary
Median AQI
44
Good
Good Days
75.6%
276 of 365 days
Max AQI
154
Unhealthy
Health Grade
Good
90th pct: 61
AQI Day Breakdown (2025)
Distribution of 365 monitored days across EPA AQI categories.
Good
276
76%
Moderate
88
24%
USG
0
0%
Unhealthy
1
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Redding, CA metro area's air quality is rated Good based on 75.6% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 0 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 154. Sensitive groups should monitor real-time conditions at AirNow.gov.
How does the Redding, CA metro compare?
How Redding, CA compares
5-Year Air Quality Trend
Air quality is worsening in the Redding, CA metro. Highest Good-day share: 2020 (79.4%, 286 of 360 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 286 | 72 | 2 | 41 | 171 |
| 2021 | 222 | 111 | 12 | 46 | 240 |
| 2022 | 253 | 106 | 0 | 45 | 119 |
| 2023 | 247 | 112 | 0 | 45 | 1435 |
| 2024 | 268 | 94 | 0 | 44 | 232 |
| 2025 | 276 | 88 | 1 | 44 | 154 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Redding, CA (44).
Bartlesville, OK
Median AQI 44 · 68.0% Good-day share
Berlin, NH-VT
Median AQI 44 · 81.5% Good-day share
Bloomington, IL
Median AQI 44 · 66.0% Good-day share
Boston-Cambridge-Newton, MA-NH
Median AQI 44 · 71.0% Good-day share
Bridgeport-Stamford-Norwalk, CT
Median AQI 44 · 64.7% Good-day share
Buffalo-Cheektowaga-Niagara Falls, NY
Median AQI 44 · 63.8% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Redding, CA's 1 (independent of median AQI).
Ann Arbor, MI
1 unhealthy-or-worse days · median AQI 41
Bangor, ME
1 unhealthy-or-worse days · median AQI 33
Baraboo, WI
1 unhealthy-or-worse days · median AQI 35
Beaumont-Port Arthur, TX
1 unhealthy-or-worse days · median AQI 52
Beaver Dam, WI
1 unhealthy-or-worse days · median AQI 40
Bellingham, WA
1 unhealthy-or-worse days · median AQI 31
Frequently Asked Questions
What is the 90th percentile AQI for Redding, CA? ▼
How many unhealthy air days does Redding, CA have? ▼
What is the air quality in the Redding, CA metro area? ▼
Is air quality in Redding, CA getting better or worse? ▼
What does AQI 44 mean for health? ▼
How does Redding, CA compare to other metro areas? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Redding, 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, Redding, CA · 2020–2025