Metro area air quality · 2025

Myrtle Beach-Conway-North Myrtle Beach, SC-NC

Median AQI 39 (Good). 82.5% of monitored days rated Good across this metro's EPA monitoring network.

Compiled by PlainAirData · August 23, 2026

39
Median AQI: 82.5%
Good-air days: 2
Unhealthy days: 72%
Cleaner than US metros

Myrtle Beach-Conway-North Myrtle Beach, SC-NC posted a 2025 median AQI of 39 (Good) with 82.5% Good days

According to the U.S. EPA Air Quality System, the Myrtle Beach-Conway-North Myrtle Beach, SC-NC CBSA recorded a median AQI of 39 across 325 monitored days in 2025, with 82.5% rated Good and 2 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 Myrtle Beach-Conway-North Myrtle Beach, SC-NC CBSA's 82.5% Good-day share places it cleaner than 72% 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 Myrtle Beach-Conway-North Myrtle Beach, SC-NC.
2020–2025 Good-day shift: Myrtle Beach-Conway-North Myrtle Beach, SC-NC's Good-day share moved -17.3 points from 2020 to 2025 (median AQI +7).
Median AQI: Median AQI: 39

Aggregated from EPA Air Quality System (2025), 325 monitored days. EPA AQS →

The verdict

Myrtle Beach-Conway-North Myrtle Beach, SC-NC sits in the upper Good-day tercile among EPA CBSA metros on this site (82.5% of 325 monitored days). On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 39 and 82.5% of 325 monitored days in the Good band.

39
median AQI · Good: 82.5%
days rated Good: 72%
cleaner than US metros: 170
worst single reading

2 days reached Unhealthy or worse across the metro's monitors in 2025.

Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro's peak single-day AQI rose from 87 to 170 between the 2024 and 2025 EPA annual releases, a change of +83 points.
Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro's Good-day share rose from 78.8% to 82.7% between the 2024 and 2025 EPA annual releases, a change of +3.9 percentage points.
Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro's Unhealthy-category days rose from 0 to 2 between the 2024 and 2025 EPA annual releases, a change of +2 days.

Myrtle Beach-Conway-North Myrtle Beach, SC-NC sits in the upper Good-day tercile among EPA CBSA metros on this site (82.5% of 325 monitored days). Signature read: 82.5% 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 325 measured days in 2025 (Good / Good). The monitored-day split lands at 268 Good (82%), 54 Moderate (17%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 55; the highest single-day reading hit 170 (Unhealthy).

Across 2020–2025, Good-day share shifted -17.3 points and median AQI moved +7 (worsening). The annual record contains 2 days 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

Good

Good Days

82.5%

268 of 325 days

Max AQI

170

Unhealthy

Health Grade

Good

90th pct: 55

AQI Day Breakdown (2025)

Distribution of 325 monitored days across EPA AQI categories.

Good

268

82%

Moderate

17%

USG

Unhealthy

Very Unhealthy

Hazardous

Health Impact Assessment

Good

The Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro area's air quality is rated Good based on 82.5% good air days. There were 2 unhealthy days in 2025 when outdoor activity should be limited.

Air quality is acceptable most days, but 1 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 170. Sensitive groups should monitor real-time conditions at AirNow.gov.

How does the Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro compare?

How Myrtle Beach-Conway-North Myrtle Beach, SC-NC compares

Compare against

Good-day share better than typical

Myrtle Beach-Conway-North Myrtle Beach, SC-NC 82.5%

Bay City, MI 70.4%

Typical US metro 70.6%

Median AQI better than typical

Myrtle Beach-Conway-North Myrtle Beach, SC-NC 39

Bay City, MI 39

Typical US metro 41

Unhealthy days / yr worse than typical

Myrtle Beach-Conway-North Myrtle Beach, SC-NC 2

Bay City, MI 0

Typical US metro 1

5-Year Air Quality Trend

Air quality is worsening in the Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro. Highest Good-day share: 2020 (100.0%, 214 of 214 monitored days).

Year	Good	Moderate	Unhealthy	Median AQI	Max AQI
2020	214	0	0	32	50
2021	238	26	0	38	90
2022	247	16	0	38	93
2023	238	94	0	43	100
2024	287	77	0	40	87
2025	268	54	2	39	170

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Myrtle Beach-Conway-North Myrtle Beach, SC-NC (39).

Bay City, MI

Median AQI 39 · 70.4% Good-day share

Brainerd, MN

Median AQI 39 · 74.3% Good-day share

Cambridge, MD

Median AQI 39 · 86.0% Good-day share

Charleston, WV

Median AQI 39 · 77.0% Good-day share

Dalton, GA

Median AQI 39 · 90.3% Good-day share

Harrisonburg, VA

Median AQI 39 · 80.0% Good-day share

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Myrtle Beach-Conway-North Myrtle Beach, SC-NC's 2 (independent of median AQI).

Ardmore, OK

2 unhealthy-or-worse days · median AQI 45

Bridgeport-Stamford-Norwalk, CT

2 unhealthy-or-worse days · median AQI 44

Chattanooga, TN-GA

2 unhealthy-or-worse days · median AQI 49

Cincinnati, OH-KY-IN

2 unhealthy-or-worse days · median AQI 56

Columbus, GA-AL

2 unhealthy-or-worse days · median AQI 48

Davenport-Moline-Rock Island, IA-IL

2 unhealthy-or-worse days · median AQI 46

Frequently Asked Questions

How many unhealthy air days does Myrtle Beach-Conway-North Myrtle Beach, SC-NC have? ▼

In 2025, the Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro area recorded 2 unhealthy air days (2 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 170.

What is the air quality in the Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro area? ▼

The Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro area has a median Air Quality Index (AQI) of 39, rated "Good." 82.5% of monitored days (268 out of 325) had good air quality in 2025.

Is air quality in Myrtle Beach-Conway-North Myrtle Beach, SC-NC getting better or worse? ▼

Air quality in the Myrtle Beach-Conway-North Myrtle Beach, SC-NC 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 100.0% (214 of 214 days). Lowest qualifying Good-day share: 2023 at 71.7% (238 of 332 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 Myrtle Beach-Conway-North Myrtle Beach, SC-NC compare to other metro areas? ▼

The Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro has 82.5% 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 Myrtle Beach-Conway-North Myrtle Beach, SC-NC? ▼

The 90th percentile AQI for the Myrtle Beach-Conway-North Myrtle Beach, SC-NC metro area is 55, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 170 (Unhealthy).

Data Sources

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