Worst air pollution Neptune Mountaineering - Boulder, today and tomorrow
Today (20 September): Air quality in Neptune Mountaineering is moderate. AQI and NO2 are moderate; PM2.5 and O3 are fair; PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 PM (NO2: 53.0/100).
Tomorrow (21 September 2026): Air quality in Neptune Mountaineering is moderate. All pollutants stay as today. Pollution peaks around 5:00 PM (NO2: 52.6/100). 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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In Neptune Mountaineering, traffic stays fairly light here, leaving wind-blown dust from nearby fields as a bigger factor than vehicle emissions. Green space in the area offers some natural filtering, softening the local particulate load somewhat. Short-term spikes can occur with unusual weather or nearby construction and traffic events. Broader regional monitoring generally reflects this same baseline, with small local variation.
Today - 20 September | Pollution peaks at 17:00
AQI:
Moderate
53.0/100
PM2.5 (fine particles):
Fair
27.8/100
PM10 (coarse particles):
Good
13.9/100
NO2 (nitrogen dioxide):
Moderate
53.0/100
O3 (ozone):
Fair
35.2/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
3.1/100
PM1 (ultrafine particles):
Good
2.9/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 17:00
AQI:
Moderate
52.6/100
PM2.5 (fine particles):
Fair
28.8/100
PM10 (coarse particles):
Good
14.0/100
NO2 (nitrogen dioxide):
Moderate
52.6/100
O3 (ozone):
Fair
38.6/100
SO2 (sulfur dioxide):
Good
2.3/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
4.0/100
PM1 (ultrafine particles):
Good
2.9/100
Other Landmarks in Boulder
Frequently Asked Questions
Is air quality bad in Neptune Mountaineering right now?
On 20 September 2026, overall air quality in Neptune Mountaineering is moderate. AQI is the main air quality indicator at 53.0/100. Pollution peaks around 5:00 PM (NO2: 53.0/100).
Will air quality be worse tomorrow in Neptune Mountaineering?
On 21 September 2026, air quality conditions in Neptune Mountaineering will be similar to today, with AQI forecast at moderate at 52.6/100. Pollution peaks around 5:00 PM (NO2: 52.6/100).
When is air pollution at its worst in Neptune Mountaineering?
Wind speeds average only around 12 km/h from September to November, with temperatures near 12°C -- calm, cool conditions that let smoke and particulate matter build up near the ground rather than clear out. From June to August, temperatures average around 23°C, warm enough for strong sun and heat to drive ground-level ozone formation.
Are air quality levels in Neptune Mountaineering 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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