Metro area air quality · 2024
New Castle, PA
Median AQI 24 (Good). 100.0% of monitored days rated Good across this metro's EPA monitoring network.
- 24
- Median AQI
- 100.0%
- Good-air days
- 0
- Unhealthy days
New Castle, PA posted a 2024 median AQI of 24 (Good) with 100.0% Good days
According to the U.S. EPA Air Quality System, the New Castle, PA CBSA recorded a median AQI of 24 across 31 monitored days in 2024, with 100.0% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Closest median-AQI peer
- Americus, GA (93.4% Good, median AQI 38) is the closest nationwide median-AQI peer to New Castle, PA.
- 2020–2024 Good-day shift
- New Castle, PA's Good-day share moved +2.5 points from 2020 to 2024 (median AQI -7).
- Median AQI
- Median AQI: 24
- Good days
- Good days: 100.0%
Aggregated from EPA Air Quality System (2024), 31 monitored days. EPA AQS →
The verdict
The New Castle, PA metro runs good on the EPA scale, a median AQI of 24 with 100.0% of 31 monitored days in the Good band.
- 24
- median AQI · Good
- 100.0%
- days rated Good
- 31
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2024.
Annual release change
What changed in the 2023 EPA annual release
- New Castle, PA metro's Good-day share rose from 92.5% to 95.5% between the 2022 and 2023 EPA annual releases, a change of +3.0 percentage points.
- New Castle, PA metro's median AQI fell from 37 to 34 between the 2022 and 2023 EPA annual releases, a change of -3 points.
Insights: New Castle, PA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 24 over 31 measured days in 2024, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 31 Good days (100%), 0 Moderate (0%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 29 while the highest single-day reading hit 31 (Good). Metro residents averaged roughly 30.0 clean-air days per 30-day window across the reporting year.
Across the 2020–2024 trend window, the share of monitored days rated Good shifted by +2.5 points (measured against 363 monitored days in 2020 and 31 in 2024, so raw day counts are not comparable) and the median AQI moved -7 points, which classifies the multi-year trajectory as stable. The metro recorded no Unhealthy-tier days in this annual dataset. Metros with comparable AQI profiles include Americus, GA (93.4% good, AQI 38); Summerville, GA (96.3% good, AQI 39); Ada, OK (71.6% good, AQI 43).
Air Quality Summary
Median AQI
24
Good
Good Days
100.0%
31 of 31 days
Max AQI
31
Good
Health Grade
Excellent
90th pct: 29
AQI Day Breakdown (2024)
Distribution of 31 monitored days across EPA AQI categories.
Good
31
100%
Moderate
0
0%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The New Castle, PA metro area's air quality is rated Excellent based on 100.0% 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 New Castle, PA metro compare?
How New Castle, PA compares
5-Year Air Quality Trend
Air quality is stable in the New Castle, PA metro. Highest Good-day share: 2020 (97.5%, 354 of 363 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 354 | 9 | 0 | 31 | 93 |
| 2021 | 259 | 19 | 0 | 31 | 87 |
| 2022 | 223 | 18 | 0 | 37 | 126 |
| 2023 | 254 | 12 | 0 | 34 | 119 |
| 2024 | 31 | 0 | 0 | 24 | 31 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near New Castle, PA (24).
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All Metro Areas
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Air Quality Guides
Frequently Asked Questions
What is the air quality in the New Castle, PA metro area? ▼
How many unhealthy air days does New Castle, PA have? ▼
Is air quality in New Castle, PA getting better or worse? ▼
What does AQI 24 mean for health? ▼
What is the 90th percentile AQI for New Castle, PA? ▼
How does New Castle, PA compare to other metro areas? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. 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 files (metro-level) · 2020–2025
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Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.