La Mesa, CA
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.
La Mesa, CA air quality summary: La Mesa, CA has a clean air score of 65.2 and a grade of C, with an annual PM2.5 mean of 9.1. This indicates a moderate level of air quality for the city. La Mesa recorded an annual PM2.5 mean of 9.1 micrograms per cubic meter. Long-term air quality in La Mesa has been worsening over recent years.
Clean Air Score
A score of 65.2 and a C grade reflect air quality that is generally acceptable but occasionally challenged by regional pollution. These metrics suggest a moderate cumulative exposure for residents over several years.
🏡 What This Means for Buying
For those evaluating La Mesa, air quality should be considered as one factor among many in their housing search. A C grade indicate that while air quality is typical for a suburban urban area, it is not consistently pristine.
Indoor Air Quality in La Mesa, CA
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 La Mesa.
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 La Mesa:
- Wildfire smoke infiltration (PM2.5)
- 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.
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🩺 My Health Risk Assessment
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, La Mesa's air quality worsened by 0.7 μg/m³. Based on NBER studies, this change correlates with a estimated 2.8% decrease in relative property value retention.
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Why La Mesa earned a 65.2
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% | 40.8 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 46.5 |
| Seasonal Variability | 10% | 89.1 |
| 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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La Mesa Air Quality FAQs
Is La Mesa a good fit for people who care about long-term air quality?
La Mesa, CA is a moderate option with its 65.2 score and C grade. The annual PM2.5 level of 9.1 represents a moderate level of exposure for long-term residents.
How often does La Mesa experience unhealthy air?
La Mesa reports 0% unhealthy air days, contributing to its C grade and 9.1 PM2.5 mean. This suggests that while average pollution levels are moderate, acute spikes are not common.
Is La Mesa's air quality improving or getting worse over time?
The air quality in La Mesa is currently on a worsening trend, indicating that pollution levels have increased recently. This trend is an important consideration for long-term residency in the area.
How does air quality vary across La Mesa?
Air quality can vary within La Mesa due to local traffic, industry, and location patterns, as local emissions and topography can create differences in air clarity.