Today | Weather | Monday, September 21, 2026

Weather in Rochester, New Hampshire

01:56 PM
Now
Cloudy Weather
66° F
Feels Like 70°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 3
Humidity 53 %
Today
Cloudy Weather
Day 68°
Night 46°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 4

Rochester Weather Forecast Updated

Last updated on

Air Quality in Rochester

NOW
40 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.1 µg/m³
PM10 3.64 µg/m³
O3 0.043 ppm
NO2 1.2 ppb
SO2 0.4 ppb
CO 0.17 ppm
NH3 0.17 µg/m³
NO 0.53 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.53.1 µg/m³
PM103.64 µg/m³
O384.7 µg/m³
NO22.3 µg/m³
SO20.96 µg/m³
CO193.14 µg/m³
NH30.17 µg/m³
NO0.53 µg/m³