Metro area air quality · 2025

Florence, SC

Median AQI 46 (Good). 62.3% of monitored days rated Good across this metro's EPA monitoring network.

Compiled by PlainAirData · August 23, 2026

46
Median AQI: 62.3%
Good-air days: 0
Unhealthy days: 30%
Cleaner than US metros

Florence, SC posted a 2025 median AQI of 46 (Good) with 62.3% Good days

According to the U.S. EPA Air Quality System, the Florence, SC CBSA recorded a median AQI of 46 across 361 monitored days in 2025, with 62.3% 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 Florence, SC CBSA's 62.3% Good-day share places it cleaner than 30% of US metros in 2025.
Closest median-AQI peer: Albany, GA (57.3% Good, median AQI 46) is the closest nationwide median-AQI peer to Florence, SC.
2020–2025 Good-day shift: Florence, SC's Good-day share moved -20.3 points from 2020 to 2025 (median AQI +8).
Median AQI: Median AQI: 46

Aggregated from EPA Air Quality System (2025), 361 monitored days. EPA AQS →

The verdict

Florence, SC lands in the lower Good-day tercile (62.3% Good), a thinner clean-air share than most CBSA peers here. On the EPA scale the metro runs good, more polluted than the median US metro, with a median AQI of 46 and 62.3% of 361 monitored days in the Good band.

46
median AQI · Good: 62.3%
days rated Good: 30%
cleaner than US metros: 108
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Florence, SC metro's Good-day share rose from 61.4% to 62.5% between the 2024 and 2025 EPA annual releases, a change of +1.1 percentage points.

Florence, SC lands in the lower Good-day tercile (62.3% Good), a thinner clean-air share than most CBSA peers here. Signature read: 62.3% 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 46 over 361 measured days in 2025 (Good / Moderate). The monitored-day split lands at 225 Good (62%), 135 Moderate (37%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 61; the highest single-day reading hit 108 (USG).

Across 2020–2025, Good-day share shifted -20.3 points and median AQI moved +8 (worsening). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Albany, GA (57.3% good, AQI 46); Athens-Clarke County, GA (57.8% good, AQI 46); Brookings, SD (58.6% good, AQI 46).

Health effects of air pollution →

Air Quality Summary

Median AQI

Good

Good Days

62.3%

225 of 361 days

Max AQI

108

USG

Health Grade

Moderate

90th pct: 61

AQI Day Breakdown (2025)

Distribution of 361 monitored days across EPA AQI categories.

Good

225

62%

Moderate

135

37%

USG

Unhealthy

Very Unhealthy

Hazardous

Health Impact Assessment

Moderate

The Florence, SC metro area's air quality is rated Moderate based on 62.3% 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 Florence, SC metro compare?

How Florence, SC compares

Compare against

Good-day share worse than typical

Florence, SC 62.3%

Albany, GA 57.3%

Typical US metro 70.6%

Median AQI worse than typical

Florence, SC 46

Albany, GA 46

Typical US metro 41

Unhealthy days / yr better than typical

Florence, SC 0

Albany, GA 0

Typical US metro 1

5-Year Air Quality Trend

Air quality is worsening in the Florence, SC metro. Highest Good-day share: 2020 (82.8%, 299 of 361 monitored days).

Year	Good	Moderate	Median AQI	Max AQI
2020	299	62	38	95
2021	260	90	41	86
2022	231	132	45	84
2023	188	176	50	104
2024	223	140	47	100
2025	225	135	46	108

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Florence, SC (46).

Albany, GA

Median AQI 46 · 57.3% Good-day share

Athens-Clarke County, GA

Median AQI 46 · 57.8% Good-day share

Brookings, SD

Median AQI 46 · 58.6% Good-day share

Chico, CA

Median AQI 46 · 65.2% Good-day share

Colorado Springs, CO

Median AQI 46 · 68.2% Good-day share

Davenport-Moline-Rock Island, IA-IL

Median AQI 46 · 56.7% Good-day share

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Florence, SC'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, OR

0 unhealthy-or-worse days · median AQI 27

Albany-Schenectady-Troy, NY

0 unhealthy-or-worse days · median AQI 41

Frequently Asked Questions

How many unhealthy air days does Florence, SC have? ▼

In 2025, the Florence, SC metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 108.

What is the air quality in the Florence, SC metro area? ▼

The Florence, SC metro area has a median Air Quality Index (AQI) of 46, rated "Good." 62.3% of monitored days (225 out of 361) had good air quality in 2025.

Is air quality in Florence, SC getting better or worse? ▼

Air quality in the Florence, SC metro is worsening across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2020 at 82.8% (299 of 361 days). Lowest qualifying Good-day share: 2023 at 51.6% (188 of 364 days).

What does AQI 46 mean for health? ▼

An AQI of 46 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 Florence, SC compare to other metro areas? ▼

The Florence, SC metro has 62.3% good air days. Similar metros: Albany, GA (57.3% good), Athens-Clarke County, GA (57.8% good), Brookings, SD (58.6% good).

What is the 90th percentile AQI for Florence, SC? ▼

The 90th percentile AQI for the Florence, SC metro area is 61, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 108 (USG).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Florence, SC, 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, Florence, SC · 2020–2025 Accessed 2026-07-06