Lancaster, PA
Long-term air quality
What this page tells you
This page combines annual PM2.5, unhealthy days, 5-year trend, and data coverage so you can compare long-term air quality, not just today's reading.
Lancaster, PA air quality summary: Lancaster, PA has a clean air score of 68.6 and a grade of C, with an annual PM2.5 mean of 8.1. These metrics are indicative of a moderate air quality environment for the community. Lancaster recorded an annual PM2.5 mean of 8.1 micrograms per cubic meter. Long-term air quality in Lancaster has been improving over recent years.
Clean Air Score
A score of 68.6 and a C grade show that Lancaster faces some persistent challenges in meeting the highest air quality benchmarks. This performance suggests a moderate cumulative exposure for its residents over the long term.
🏡 What This Means for Buying
For those considering buying a home in Lancaster, air quality should be factored in as a moderate consideration. A C grade indicate that while air quality is generally acceptable, it is not as clean as in many other regions.
Indoor Air Quality in Lancaster, PA
Outdoor pollution can still affect indoor air when windows are open, filtration is weak, or wildfire smoke moves in.
How to react when today's AQI changes
Use the AQI bands below to decide whether to open windows, run an air purifier, or stay indoors when pollution spikes in Lancaster.
AQI 0-50
GoodOpen windows: Open windows if you want fresh air.
Air purifier: No purifier needed for most homes.
Indoor activity: Normal indoor activity is fine.
AQI 51-100
ModerateOpen windows: Sensitive groups should limit open-window time.
Air purifier: Use fans or filtration if dust or pollen is bothering you.
Indoor activity: Most people can stay active indoors.
AQI 101-150
Unhealthy for Sensitive GroupsOpen windows: Keep windows closed.
Air purifier: Run a HEPA purifier in the main room and bedroom.
Indoor activity: Sensitive groups should reduce outdoor exposure.
AQI 151+
UnhealthyOpen windows: Keep windows and doors closed.
Air purifier: Run HEPA continuously and seal obvious drafts.
Indoor activity: Stay indoors as much as possible; use an N95 if you must go out.
Common indoor air concerns in Lancaster:
- Seasonal pollen and dust mite allergens
- VOCs from household products
Recommended action: If today's AQI reaches 101 or higher, close windows and run HEPA filtration before indoor air starts to feel smoky or stale.
Top Products for Lancaster Homes:
🩺 My Health Risk Assessment
See how Lancaster's air quality affects you and your family specifically.
Health Advice
Good for most outdoor activities.
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, Lancaster's air quality improved by 0.6 μg/m³. Based on NBER studies, this change correlates with a estimated 2.4% increase in relative property value retention.
Cleaner Alternatives in PA
🏆 Best Neighborhoods in Lancaster
We analyzed air quality across multiple zip codes to find the healthiest spots to live. See which neighborhoods ranked #1.
Why Lancaster earned a 68.6
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
Find the cleanest hours for your run today.
Cycling Forecast
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📅 Past 30 Days Trend
Real-time daily PM2.5 AQI
🌸 Pollen Outlook
Current Seasonal Forecast
How it worksBased on current seasonal forecast data. Not a long-term pollution rating or relocation score.
Score Breakdown
| Component | Weight | Score Contribution |
|---|---|---|
| Annual Air Quality | 40% | 55.6 |
| Unhealthy Days | 25% | 89.1 |
| 5-Year Trend | 20% | 53 |
| Seasonal Variability | 10% | 90.9 |
| Extreme Events | 5% | 100 |
Explore More Air Quality Data
Frequently Asked Questions
About This Data
Data Sources
Historical air quality mapping and scoring are based completely on official U.S. Environmental Protection Agency (EPA) AirNow API data. 5-day AQI forecasts are provided by WAQI.
Methodology
Our Clean Air Score (0-100) is a proprietary algorithm that weighs multiple factors:
- Annual PM2.5 averages (40%)
- Frequency of unhealthy days (25%)
- 5-year pollution trends (20%)
- Seasonal variability and extreme events (15%)
Updates & Accuracy
Real-time data is updated hourly. Historical aggregate scores are recalculated monthly to reflect the latest trends. While we strive for accuracy, sensor maintenance and local conditions can affect individual readings.
Practical Advice
When AQI > 100: Sensitive groups (children, elderly, asthmatics) should limit prolonged outdoor exertion.
When AQI > 150: Everyone should avoid outdoor exercise and keep windows closed.
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Lancaster Air Quality FAQs
Is Lancaster a good fit for people who care about long-term air quality?
Lancaster, PA is a moderate choice with its 68.6 score and C grade. The annual PM2.5 mean of 8.1 reflects an environment that is generally acceptable but could be improved.
How often does Lancaster experience unhealthy air?
Lancaster experiences unhealthy air days 0.5% of the time, which is reflected in its C grade and 8.1 PM2.5 mean. This low frequency indicates that acute pollution events are uncommon.
Is Lancaster's air quality improving or getting worse over time?
The air quality trend in Lancaster is improving, which is a positive development for the city's environmental health. This trend indicates that long-term conditions are becoming more favorable over time.
How does air quality vary across Lancaster?
FAQ item 4 should point readers to neighborhood or ZIP-level detail.