Worst air pollution Barrio Viejo - Tucson, today and tomorrow
Today (20 September): Air quality in Barrio Viejo is poor. AQI and PM10 are poor; PM2.5 is moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 63.5/100).
Tomorrow (21 September 2026): Air quality in Barrio Viejo is moderate. AQI improves to moderate; PM10 decreases to moderate; all other pollutants stay as today. Pollution peaks around 2:00 AM (PM10: 47.4/100). Airmine updates local air quality forecasts four times daily.
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Tucson's Barrio Viejo air quality reflects the historic Mexican-American neighbourhood adjacent to downtown, with vehicle traffic on the surrounding arterials contributing local sources. The Sonoran Desert basin creates temperature inversion episodes, while the neighbourhood's historic low-density character and the consistent afternoon desert winds generally maintain moderate Tucson metropolitan readings and Barrio Viejo generally tracks at typical inner Tucson historic neighbourhood levels throughout the year.
Today - 20 September | Pollution peaks at 10:00
AQI:
Poor
63.5/100
PM2.5 (fine particles):
Moderate
48.0/100
PM10 (coarse particles):
Poor
63.5/100
NO2 (nitrogen dioxide):
Good
15.6/100
O3 (ozone):
Good
18.3/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
4.4/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 02:00
AQI:
Moderate
47.4/100
PM2.5 (fine particles):
Moderate
43.2/100
PM10 (coarse particles):
Moderate
47.4/100
NO2 (nitrogen dioxide):
Good
17.0/100
O3 (ozone):
Good
18.0/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
3.8/100
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Frequently Asked Questions
Is air quality bad in Barrio Viejo right now?
On 20 September 2026, overall air quality in Barrio Viejo is poor. AQI is the main air quality indicator at 63.5/100. Pollution peaks around 10:00 AM (PM10: 63.5/100).
Will air quality be worse tomorrow in Barrio Viejo?
On 21 September 2026, air quality conditions in Barrio Viejo will be better than today, with AQI forecast at moderate at 47.4/100. Pollution peaks around 2:00 AM (PM10: 47.4/100).
When is air pollution at its worst in Barrio Viejo?
Barrio Viejo experiences the same seasonal air quality swings as the rest of Tucson — the calmest, cleanest stretch usually falls between late autumn and early spring, whereas intense summer heat combines with occasional dust events to create the year's worst episodes. Sudden haboob-style dust storms can appear with little warning during the spring wind season.
Are air quality levels in Barrio Viejo based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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