Worst air pollution Keene, New Hampshire, today and tomorrow

On 20 September 2026, overall air quality in Keene, New Hampshire is good. AQI is the main air quality indicator at 17.5/100. Pollution peaks around 12:00 PM (O3: 17.5/100).

On 21 September 2026, air quality conditions in Keene, New Hampshire will be similar to today, with AQI forecast at good at 17.2/100. Pollution peaks around 5:00 AM (O3: 17.2/100).

Air quality across Keene rises and falls with the seasons: the cleanest conditions typically arrive with the more unsettled weather of spring and autumn, but summer heat and regional haze drifting up from the Midwest and South drive ozone spikes. Coastal sea breezes can offer some relief from inland summer ozone buildup.

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.

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.