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San Juan, TX

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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.

Jump to indoor air guidance Read the formula
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Note: San Juan does not have its own EPA monitor and that the page relies on the nearest monitor in Edinburg, 7.8 miles away.
📍 Homebuyer Guide 📊 Data Coverage: 100% 📅 2021-2025 Trends

San Juan, TX air quality summary: San Juan, TX receives a clean air score of 30.2 and a grade of F, reflecting significant long-term air quality challenges. The city's annual mean PM2.5 concentration is 12.1 µg/m³. The annual mean concentration of PM2.5 in San Juan is 12.1 µg/m³. Long-term air quality in San Juan has been worsening over recent years.

Clean Air Score

30
Grade F

A clean air score of 30.2 and a grade of F signify that San Juan experiences high long-term exposure to particulate matter. These ratings indicate poor environmental conditions for long-term residency.

🏡 What This Means for Buying

San Juan's air quality should be a primary consideration for anyone evaluating long-term living conditions. The F grade reflects a level of particulate matter that is elevated by national standards.

Best time for outdoor visits: Check seasonal chart

Indoor Air Quality in San Juan, TX

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 San Juan.

AQI 0-50

Good

Open 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

Moderate

Open 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 Groups

Open 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+

Unhealthy

Open 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 San Juan:

  • 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 San Juan Homes:

Best HEPA Air Purifier for San Juan Wildfire Smoke PM2.5 Indoor Air Quality Monitor Formaldehyde & VOC Detector
People also search: "indoor air quality in San Juan, TX"

🩺 My Health Risk Assessment

See how San Juan's air quality affects you and your family specifically.

Current Risk Level
High Risk
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💡

Health Advice

Reduce prolonged outdoor exertion.

Est. Annual "Risky Days" for you: ~12 days/year

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🏡 Property Value Impact Analysis

Estimated Impact (5-Year)
Concern Signal
-7.2% theoretical value retention

Between 2019 and 2024, San Juan's air quality worsened by 1.8 μg/m³. Based on NBER studies, this change correlates with a estimated 7.2% decrease in relative property value retention.

* Methodology: Comparison based on National Bureau of Economic Research (NBER) Working Paper 15655 correlation between PM2.5 reduction and housing prices. This is a theoretical estimate for informational purposes only.
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Annual PM2.5
12.1 μg/m³
WHO Target: <5.0
Good Days
96.7 %
% days AQI < 100
5-Year Trend
Worsening
↓ Worsening
Long-term direction
Extreme Days
0 days/yr
Days AQI > 150 (Est.)

Why San Juan earned a 30.2

Raw inputs, scoring weights, and data coverage for this city.

See full formula
Annual Air Quality
12.1 μg/m³
Component score 0 × 40% = 0.0 points
Unhealthy Days
12 days/yr est.
3.3% of days above AQI 100. Component score 34.4 × 25% = 8.6 points
5-Year Trend
Worsening
Component score 41 × 20% = 8.2 points
Seasonal Variability
66.1
Higher means steadier month-to-month air. Weighted contribution: 6.6 points
Extreme Events
100
Captures severe pollution spikes. Weighted contribution: 5.0 points
Coverage & Monitoring
100%
Proxy monitor: Edinburg (7.8 miles away)
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Best Time to Run

Find the cleanest hours for your run today.
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Cycling Forecast

Avoid pollution spikes on your next ride.

📅 Past 30 Days Trend

Real-time daily PM2.5 AQI

Live Data

Score Breakdown

Component Weight Score Contribution
Annual Air Quality 40% 0
Unhealthy Days 25% 34.4
5-Year Trend 20% 41
Seasonal Variability 10% 66.1
Extreme Events 5% 100

Explore More Air Quality Data

View more cities in TX See how San Juan compares nationally

Frequently Asked Questions

How often is this air quality data updated? Our historical trend models and annual rankings are updated regularly based on official EPA data to ensure reports reflect the latest available long-term trends.
What sources does CleanAirData use? We rely strictly on official U.S. Environmental Protection Agency (EPA) monitoring station data for all historical air quality scoring and reports.
Data sourced from U.S. Environmental Protection Agency (EPA) — See our methodology

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.

Data provided for informational purposes only. Always consult local health officials during extreme smoke or pollution events.

More Cities in TX

Lubbock Grade A
Score: 89.1/100
Plainview Grade A
Score: 89.1/100
Amarillo Grade B
Score: 84.9/100
Wichita Falls Grade B
Score: 79.5/100
Galveston Grade B
Score: 77/100
Texas City Grade B
Score: 77/100

Similar Rankings Nationwide

#2758 Edinburg, TX
Score: 30.2/100
#2759 Pharr, TX
Score: 30.2/100
#2760 Weslaco, TX
Score: 30.2/100
#2761 Alamo, TX
Score: 30.2/100
#2762 Mercedes, TX
Score: 30.2/100
#2763 Donna, TX
Score: 30.2/100

San Juan Air Quality FAQs

Is San Juan a good fit for people who care about long-term air quality?

San Juan's clean air score of 30.2 and grade of F indicate very high long-term particulate exposure. The annual PM2.5 mean of 12.1 µg/m³ is considered elevated for long-term health considerations.

How frequent is unhealthy air in San Juan?

In San Juan, 3.3% of days are classified as unhealthy, reflecting its F grade and PM2.5 mean of 12.1 µg/m³. Residents face more frequent exposure to pollution than in most other cities.

Is air quality in San Juan improving or getting worse over time?

The air quality trend in San Juan is currently worsening, indicating a decline in long-term conditions over recent years.

Does air quality vary within San Juan?

Air quality can vary within the city due to local traffic, industry, and location patterns, without naming specific districts.