Worst air pollution St. Louis Cathedral - New Orleans, today and tomorrow
Today (20 September): Air quality in St. Louis Cathedral is very poor. AQI and PM10 are very poor; PM2.5 is moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (PM10: 82.9/100).
Tomorrow (21 September 2026): Air quality in St. Louis Cathedral is moderate. AQI improves to moderate; PM10 decreases to moderate; all other pollutants stay as today. Pollution peaks around 9:00 AM (PM10: 56.8/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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New Orleans' St. Louis Cathedral air quality reflects the historic French Quarter Jackson Square position, with vehicle traffic on Decatur Street and the concentrated tourism character contributing local sources. The Mississippi River provides limited ventilation from the south, while the neighbourhood's walkable historic character and the open Jackson Square plaza generally maintain moderate New Orleans metropolitan readings throughout most of the year.
Today - 20 September | Pollution peaks at 11:00
AQI:
Very poor
82.9/100
PM2.5 (fine particles):
Moderate
47.8/100
PM10 (coarse particles):
Very poor
82.9/100
NO2 (nitrogen dioxide):
Good
0.3/100
O3 (ozone):
Good
9.1/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.2/100
PM1 (ultrafine particles):
Good
6.0/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 09:00
AQI:
Moderate
56.8/100
PM2.5 (fine particles):
Moderate
42.9/100
PM10 (coarse particles):
Moderate
56.8/100
NO2 (nitrogen dioxide):
Good
0.3/100
O3 (ozone):
Good
10.4/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
0.8/100
PM1 (ultrafine particles):
Good
3.9/100
Other Landmarks in New Orleans
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Frequently Asked Questions
Is air quality bad in St. Louis Cathedral right now?
On 20 September 2026, overall air quality in St. Louis Cathedral is very poor. AQI is the main air quality indicator at 82.9/100. Pollution peaks around 11:00 AM (PM10: 82.9/100).
Will air quality be worse tomorrow in St. Louis Cathedral?
On 21 September 2026, air quality conditions in St. Louis Cathedral will be better than today, with AQI forecast at moderate at 56.8/100. Pollution peaks around 9:00 AM (PM10: 56.8/100).
When is air pollution at its worst in St. Louis Cathedral?
St. Louis Cathedral experiences the same seasonal air quality swings as the rest of New Orleans. Typically, the cleanest stretch usually comes in winter, once the long, hot ozone season has passed, while the long, hot, humid summer is the toughest stretch, compounded by industrial emissions. Hurricane season can occasionally disrupt normal pollution patterns, for better or worse depending on the storm.
Are air quality levels in St. Louis Cathedral 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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