What is the air quality in Portsmouth?

Portsmouth, United Kingdom has an annual US AQI of 51 (Reasonable) and average PM2.5 of 10.5 µg/m³, ranking #883 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Portsmouth?

July is typically the cleanest month (AQI 44) and March the most polluted (AQI 62).

Where does Portsmouth's air quality data come from?

PM2.5: 1998–2026 (monitors 2008–2026, satellite 1998–2008, 2010, 2017–2018, 2020–2022; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Portsmouth, United Kingdom — Air Quality & Clean City Guide 2026

Portsmouth Air Quality Data

Global rank	City	Continent	AQI	PM2.5
883	Portsmouth, United Kingdom	Europe	AQI 51	PM2.5 10.5 µg/m³