Metro area air quality · 2024

Greenville-Anderson-Mauldin, SC

Median AQI 49 (Good). 53.7% of monitored days rated Good across this metro's EPA monitoring network.

49
Median AQI
53.7%
Good-air days
0
Unhealthy days
19%
Cleaner than US metros

Aggregated from EPA Air Quality System (2024), 363 monitored days. EPA AQS → · NOAA →

Insights: Greenville-Anderson-Mauldin, SC metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 49 over 363 measured days in 2024, which corresponds to a Good band and a Moderate metro-wide health grade. The monitored-day split lands at 195 Good days (54%), 167 Moderate (46%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 67 while the highest single-day reading hit 115 (USG). Metro residents averaged roughly 16.1 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by -38 and the median AQI moved +4 points, which classifies the multi-year trajectory as worsening. 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 Boulder, CO (57.9% good, AQI 49); Carlsbad-Artesia, NM (51.4% good, AQI 49); Colorado Springs, CO (55.2% good, AQI 49).

Air Quality Summary

Median AQI

49

Good

Good Days

53.7%

195 of 363 days

Max AQI

115

USG

Health Grade

Moderate

90th pct: 67

AQI Day Breakdown (2024)

Distribution of 363 monitored days across EPA AQI categories.

Good

195

54%

Moderate

167

46%

USG

1

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Greenville-Anderson-Mauldin, SC metro area's air quality is rated Moderate based on 53.7% 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.

How does the Greenville-Anderson-Mauldin, SC metro compare?

How Greenville-Anderson-Mauldin, SC compares

Good-day share worse than US avg
Greenville-Anderson-Mauldin, SC 53.7%
Boulder, CO 57.9%
US average 70.2%
Median AQI worse than US avg
Greenville-Anderson-Mauldin, SC 49
Boulder, CO 49
US average 41
Unhealthy days / yr better than US avg
Greenville-Anderson-Mauldin, SC 0
Boulder, CO 1
US average 1

5-Year Air Quality Trend

Air quality is worsening in the Greenville-Anderson-Mauldin, SC metro. Best year: 2020 (233 good days).

Year Good Moderate Unhealthy Median AQI
2020 233 132 0 45
2021 180 184 0 51
2022 178 187 0 51
2023 167 196 0 52
2024 195 167 0 49

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Greenville-Anderson-Mauldin, SC.

Boulder, CO

AQI 49 · 57.9% good

49

Carlsbad-Artesia, NM

AQI 49 · 51.4% good

49

Colorado Springs, CO

AQI 49 · 55.2% good

49

Columbus, GA-AL

AQI 49 · 52.5% good

49

El Dorado, AR

AQI 49 · 51.2% good

49

Glenwood Springs, CO

AQI 49 · 57.9% good

49

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Air Quality Guides

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Health Effects of Air Pollution

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Frequently Asked Questions

What is the air quality in the Greenville-Anderson-Mauldin, SC metro area? ▼
The Greenville-Anderson-Mauldin, SC metro area has a median Air Quality Index (AQI) of 49, rated "Good." 53.7% of monitored days (195 out of 363) had good air quality in 2024.
How many unhealthy air days does Greenville-Anderson-Mauldin, SC have? ▼
In 2024, the Greenville-Anderson-Mauldin, SC metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 115.
Is air quality in Greenville-Anderson-Mauldin, SC getting better or worse? ▼
Air quality in the Greenville-Anderson-Mauldin, SC metro is worsening based on 5-year trends (2020-2024). Best year: 2020 with 233 good days. Worst year: 2023 with 167 good days.
What does AQI 49 mean for health? ▼
An AQI of 49 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 Greenville-Anderson-Mauldin, SC? ▼
The 90th percentile AQI for the Greenville-Anderson-Mauldin, SC metro area is 67, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 115 (USG).
How does Greenville-Anderson-Mauldin, SC compare to other metro areas? ▼
The Greenville-Anderson-Mauldin, SC metro has 53.7% good air days. Similar metros: Boulder, CO (57.9% good), Carlsbad-Artesia, NM (51.4% good), Colorado Springs, CO (55.2% 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