Metro area air quality · 2025
Blacksburg-Christiansburg-Radford, VA
Median AQI 37 (Good). 94.4% of monitored days rated Good across this metro's EPA monitoring network.
- 37
- Median AQI
- 94.4%
- Good-air days
- 0
- Unhealthy days
- 93%
- Cleaner than US metros
Blacksburg-Christiansburg-Radford, VA posted a 2025 median AQI of 37 (Good) with 94.4% Good days
According to the U.S. EPA Air Quality System, the Blacksburg-Christiansburg-Radford, VA CBSA recorded a median AQI of 37 across 357 monitored days in 2025, with 94.4% 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 Blacksburg-Christiansburg-Radford, VA CBSA's 94.4% Good-day share places it cleaner than 93% of US metros in 2025.
- Closest median-AQI peer
- Alexandria, LA (73.7% Good, median AQI 37) is the closest nationwide median-AQI peer to Blacksburg-Christiansburg-Radford, VA.
- 2020–2025 Good-day shift
- Blacksburg-Christiansburg-Radford, VA's Good-day share moved -4.1 points from 2020 to 2025 (median AQI +1).
- Median AQI
- Median AQI: 37
Aggregated from EPA Air Quality System (2025), 357 monitored days. EPA AQS →
The verdict
Blacksburg-Christiansburg-Radford, VA sits in the upper Good-day tercile among EPA CBSA metros on this site (94.4% of 357 monitored days). On the EPA scale the metro runs good, among the cleanest 10% of US metros, with a median AQI of 37 and 94.4% of 357 monitored days in the Good band.
- 37
- median AQI · Good
- 94.4%
- days rated Good
- 93%
- cleaner than US metros
- 80
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- Blacksburg-Christiansburg-Radford, VA metro's Good-day share rose from 91.9% to 94.4% between the 2024 and 2025 EPA annual releases, a change of +2.5 percentage points.
Blacksburg-Christiansburg-Radford, VA sits in the upper Good-day tercile among EPA CBSA metros on this site (94.4% of 357 monitored days). Signature read: 94.4% 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 37 over 357 measured days in 2025 (Good / Excellent). The monitored-day split lands at 337 Good (94%), 20 Moderate (6%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 47; the highest single-day reading hit 80 (Moderate).
Across 2020–2025, Good-day share shifted -4.1 points and median AQI moved +1 (worsening). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Alexandria, LA (73.7% good, AQI 37); Athens, TN (78.2% good, AQI 37); Bennington, VT (83.6% good, AQI 37).
Air Quality Summary
Median AQI
37
Good
Good Days
94.4%
337 of 357 days
Max AQI
80
Moderate
Health Grade
Excellent
90th pct: 47
AQI Day Breakdown (2025)
Distribution of 357 monitored days across EPA AQI categories.
Good
337
94%
Moderate
20
6%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Blacksburg-Christiansburg-Radford, VA metro area's air quality is rated Excellent based on 94.4% 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 Blacksburg-Christiansburg-Radford, VA metro compare?
How Blacksburg-Christiansburg-Radford, VA compares
5-Year Air Quality Trend
Air quality is worsening in the Blacksburg-Christiansburg-Radford, VA metro. Highest Good-day share: 2020 (98.5%, 337 of 342 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 337 | 5 | 0 | 36 | 67 |
| 2021 | 331 | 27 | 0 | 38 | 74 |
| 2022 | 329 | 29 | 0 | 38 | 100 |
| 2023 | 324 | 36 | 0 | 39 | 101 |
| 2024 | 316 | 28 | 0 | 38 | 80 |
| 2025 | 337 | 20 | 0 | 37 | 80 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Blacksburg-Christiansburg-Radford, VA (37).
Alexandria, LA
Median AQI 37 · 73.7% Good-day share
Athens, TN
Median AQI 37 · 78.2% Good-day share
Bennington, VT
Median AQI 37 · 83.6% Good-day share
Cadillac, MI
Median AQI 37 · 86.0% Good-day share
Chambersburg-Waynesboro, PA
Median AQI 37 · 91.5% Good-day share
Columbia, MO
Median AQI 37 · 93.2% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Blacksburg-Christiansburg-Radford, VA'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, GA
0 unhealthy-or-worse days · median AQI 46
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Frequently Asked Questions
How many unhealthy air days does Blacksburg-Christiansburg-Radford, VA have? ▼
What is the air quality in the Blacksburg-Christiansburg-Radford, VA metro area? ▼
Is air quality in Blacksburg-Christiansburg-Radford, VA getting better or worse? ▼
What does AQI 37 mean for health? ▼
How does Blacksburg-Christiansburg-Radford, VA compare to other metro areas? ▼
What is the 90th percentile AQI for Blacksburg-Christiansburg-Radford, VA? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Blacksburg-Christiansburg-Radford, VA, 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, Blacksburg-Christiansburg-Radford, VA · 2020–2025