Metro area air quality · 2025

Torrington, CT

Median AQI 39 (Good). 81.4% of monitored days rated Good across this metro's EPA monitoring network.

39
Median AQI
81.4%
Good-air days
1
Unhealthy days
70%
Cleaner than US metros

Torrington, CT posted a 2025 median AQI of 39 (Good) with 81.4% Good days

According to the U.S. EPA Air Quality System, the Torrington, CT CBSA recorded a median AQI of 39 across 365 monitored days in 2025, with 81.4% 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 Torrington, CT CBSA's 81.4% Good-day share places it cleaner than 70% of US metros in 2025.
Closest median-AQI peer
Bay City, MI (70.4% Good, median AQI 39) is the closest nationwide median-AQI peer to Torrington, CT.
2020–2025 Good-day shift
Torrington, CT's Good-day share moved +0.3 points from 2020 to 2025 (median AQI +0).
Median AQI
Median AQI: 39

Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →

The verdict

Torrington, CT sits in the upper Good-day tercile among EPA CBSA metros on this site (81.4% of 365 monitored days). On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 39 and 81.4% of 365 monitored days in the Good band.

39
median AQI · Good
81.4%
days rated Good
70%
cleaner than US metros
161
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

2024 → 2025
  • Torrington, CT metro's peak single-day AQI rose from 119 to 161 between the 2024 and 2025 EPA annual releases, a change of +42 points.
  • Torrington, CT metro's Good-day share fell from 86.2% to 83.2% between the 2024 and 2025 EPA annual releases, a change of -3.0 percentage points.
  • Torrington, CT metro's Unhealthy-category days rose from 0 to 1 between the 2024 and 2025 EPA annual releases, a change of +1 days.

Compared against 354 monitored days in 2024 and 357 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Torrington, CT sits in the upper Good-day tercile among EPA CBSA metros on this site (81.4% of 365 monitored days). Signature read: 81.4% Good-day share (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 39 over 365 measured days in 2025 (Good / Good). The monitored-day split lands at 297 Good (81%), 59 Moderate (16%), and 8 Unhealthy-for-Sensitive-Groups (2%). The 90th-percentile AQI finished at 64; the highest single-day reading hit 161 (Unhealthy).

Across 2020–2025, Good-day share shifted +0.3 points and median AQI moved +0 (stable). The annual record contains 1 day at Unhealthy or worse. Metros with comparable AQI profiles include Bay City, MI (70.4% good, AQI 39); Brainerd, MN (74.3% good, AQI 39); Cambridge, MD (86.0% good, AQI 39).

Health effects of air pollution →

Air Quality Summary

Median AQI

39

Good

Good Days

81.4%

297 of 365 days

Max AQI

161

Unhealthy

Health Grade

Good

90th pct: 64

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

297

81%

Moderate

59

16%

USG

8

2%

Unhealthy

1

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Torrington, CT metro area's air quality is rated Good based on 81.4% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.

Air quality is acceptable most days, but 8 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 161. Sensitive groups should monitor real-time conditions at AirNow.gov.

How does the Torrington, CT metro compare?

How Torrington, CT compares

Good-day share better than typical
Torrington, CT 81.4%
Bay City, MI 70.4%
Typical US metro 70.6%
Median AQI better than typical
Torrington, CT 39
Bay City, MI 39
Typical US metro 41
Unhealthy days / yr about typical
Torrington, CT 1
Bay City, MI 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is stable in the Torrington, CT metro. Highest Good-day share: 2024 (86.2%, 305 of 354 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 300 62 0 39
2021 300 61 0 38
2022 308 54 0 40
2023 285 72 4 38
2024 305 49 0 38
2025 297 59 1 39

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Torrington, CT (39).

Bay City, MI

Median AQI 39 · 70.4% Good-day share

39

Brainerd, MN

Median AQI 39 · 74.3% Good-day share

39

Cambridge, MD

Median AQI 39 · 86.0% Good-day share

39

Charleston, WV

Median AQI 39 · 77.0% Good-day share

39

Dalton, GA

Median AQI 39 · 90.3% Good-day share

39

Harrisonburg, VA

Median AQI 39 · 80.0% Good-day share

39

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Torrington, CT's 1 (independent of median AQI).

Ann Arbor, MI

1 unhealthy-or-worse days · median AQI 41

41

Bangor, ME

1 unhealthy-or-worse days · median AQI 33

33

Baraboo, WI

1 unhealthy-or-worse days · median AQI 35

35

Bartlesville, OK

1 unhealthy-or-worse days · median AQI 44

44

Beaumont-Port Arthur, TX

1 unhealthy-or-worse days · median AQI 52

52

Beaver Dam, WI

1 unhealthy-or-worse days · median AQI 40

40

Frequently Asked Questions

How many unhealthy air days does Torrington, CT have? ▼
In 2025, the Torrington, CT metro area recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 161.
What is the air quality in the Torrington, CT metro area? ▼
The Torrington, CT metro area has a median Air Quality Index (AQI) of 39, rated "Good." 81.4% of monitored days (297 out of 365) had good air quality in 2025.
Is air quality in Torrington, CT getting better or worse? ▼
Air quality in the Torrington, CT metro is stable across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 86.2% (305 of 354 days). Lowest qualifying Good-day share: 2023 at 78.9% (285 of 361 days).
What does AQI 39 mean for health? ▼
An AQI of 39 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
How does Torrington, CT compare to other metro areas? ▼
The Torrington, CT metro has 81.4% good air days. Similar metros: Bay City, MI (70.4% good), Brainerd, MN (74.3% good), Cambridge, MD (86.0% good).
What is the 90th percentile AQI for Torrington, CT? ▼
The 90th percentile AQI for the Torrington, CT metro area is 64, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 161 (Unhealthy).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Torrington, CT, 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, Torrington, CT · 2020–2025