Lewiston, ME
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.
Lewiston, ME air quality summary: Lewiston, ME, maintains a clean air score of 89.3 and an overall grade of A. The city's average annual PM2.5 concentration is 4.2 µg/m³. Lewiston has an annual mean PM2.5 level of 4.2 µg/m³, which is considered relatively low long-term particulate exposure. Long-term air quality in Lewiston has been improving over recent years.
Clean Air Score
The clean air score of 89.3 and grade of A reflect consistently low levels of fine particulate matter over the long term. This indicates a high standard of air quality compared to national benchmarks.
🏡 What This Means for Buying
For those considering a home in Lewiston, the long-term air quality data serves as a positive indicator of stable environmental conditions. Prospective residents should evaluate this alongside other local living factors.
Indoor Air Quality in Lewiston, ME
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 Lewiston.
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 Lewiston:
- 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 Lewiston Homes:
🩺 My Health Risk Assessment
See how Lewiston's air quality affects you and your family specifically.
Health Advice
Enjoy the outdoors! Air quality is great.
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, Lewiston's air quality improved by 0.9 μg/m³. Based on NBER studies, this change correlates with a estimated 3.6% increase in relative property value retention.
Cleaner Alternatives in ME
No cleaner cities found in this state. Lewiston is already a top performer!
🏆 Best Neighborhoods in Lewiston
We analyzed air quality across multiple zip codes to find the healthiest spots to live. See which neighborhoods ranked #1.
Why Lewiston earned a 89.3
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
Find the cleanest hours for your run today.
Cycling Forecast
Avoid pollution spikes on your next ride.
📅 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% | 100 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 54.5 |
| Seasonal Variability | 10% | 92.9 |
| 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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Lewiston Air Quality FAQs
Is Lewiston a good fit for people who care about long-term air quality?
Lewiston is well-suited for those prioritizing air quality, as evidenced by its clean air score of 89.3 and grade of A. The annual PM2.5 mean of 4.2 µg/m³ reflects a low-exposure environment.
How frequent is unhealthy air in Lewiston?
In Lewiston, the percentage of unhealthy air days is 0%, indicating very low frequency of acute pollution events. This performance is consistent with the city's overall grade of A.
Is air quality in Lewiston improving or getting worse over time?
The air quality in Lewiston is improving based on recent long-term data trends.
Does air quality vary across different parts of Lewiston?
Specific neighborhood or ZIP-level details can provide more granular insights into how air quality varies across the Lewiston area.