Northwood, Pennsylvania Air Quality
Northwood has a median AQI of 41, earning an air quality grade of A- — excellent air quality that ranks better than 50% of US cities. Air quality has remained relatively stable over the past decade. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, Northwood recorded 151 good air quality days (72% of monitored days) and 1 unhealthy days.
Population: 206 • County: Blair
Current AQI
Quick Facts
| Current AQI | 13 — Good |
| Air Quality Grade | A- |
| Median AQI (2025) | 41 |
| vs. U.S. Cities | Better than 50% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 1 |
| 10-Year Trend | → Stable |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Northwood is sourced from the Altoona monitoring area, located approximately 15 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
Northwood has relatively consistent air quality throughout the year without a strong seasonal peak. Air quality is primarily influenced by local traffic, industrial activity, and regional weather patterns rather than a single seasonal driver.
AQI Trend (10 Years)
Air Quality Days by Year
Northwood Median AQI by Year
Annual EPA air quality data for Northwood — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 41 | 151 | 1 | 115 | Ozone |
| 2024 | 37 | 296 | — | 100 | Ozone |
| 2023 | 43 | 229 | 6 | 213 | PM2.5 |
| 2022 | 44 | 234 | — | 97 | PM2.5 |
| 2021 | 45 | 206 | 2 | 120 | PM2.5 |
| 2020 | 43 | 262 | — | 87 | PM2.5 |
| 2019 | 46 | 220 | — | 93 | PM2.5 |
| 2018 | 42 | 244 | 1 | 132 | Ozone |
| 2017 | 45 | 223 | — | 89 | PM2.5 |
| 2016 | 44 | 230 | 2 | 122 | PM2.5 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Northwood Air Quality
What is the air quality in Northwood today?
The current AQI in Northwood is 13, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Northwood getting better or worse?
Air quality in Northwood has been stable. The median AQI has dropped 3 points (from 44 in 2016 to 41 in 2025).
What is the most common air pollutant in Northwood?
Ozone is the primary air pollutant in Northwood, responsible for 129 days (61% of monitored days) in 2025. Ground-level ozone forms when sunlight reacts with emissions from vehicles and industry, typically peaking on hot summer afternoons.
How many unhealthy air days does Northwood have per year?
In 2025, Northwood recorded 72% good air quality days (151 days) out of 210 monitored days. There were 1 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 115.
What air quality grade does Northwood receive?
Northwood receives an air quality grade of A-, placing it better than 50% of US cities. This is based on a median AQI of 41 in 2025, with 151 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 50% of US cities
Nearby Cities
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National Rankings
See how Northwood compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Northwood
Ozone is Northwood's primary pollutant. Standard HEPA filters don't capture ozone molecules — you need activated carbon or PECO technology to chemically break them down. We highlight those units here.
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