Air quality in Leicester, England, United Kingdom today

Mr. Duck’s Air Quality Score

Moderate air today for Leicester, England, United Kingdom

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Leicester today falls into the Moderate category. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 12.0 and a PM10 reference value of 16.0, based on seven valid observations recorded by OpenAQ.

These figures reflect the current assessment without implying any trend or cause. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.

Latest sensor values

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

What the data includes

The Leicester air‑quality dataset currently includes four measured pollutants – nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤ 10 µm (PM10) and particulate matter ≤ 2.5 µm (PM2.5). The information comes from seven recent readings collected at two monitoring sites, with the most recent update recorded on 2026‑02‑10 20:00 UTC for every pollutant.

For NO₂ the observed values range from a low of 16 µg/m³ to a high of 35 µg/m³, with a median of about 25.5 µg/m³; the 10th and 90th percentiles sit at roughly 18 µg/m³ and 33 µg/m³ respectively. PM10 shows a tighter spread, varying between 13 µg/m³ and 16 µg/m³, median 14.5 µg/m³, with the central 80 % of readings falling between 13.3 µg/m³ and 15.7 µg/m³. PM2.5 values are clustered even more closely, ranging from 11 µg/m³ to 12 µg/m³, median 11.5 µg/m³, with the 10th‑90th percentile band of 11.1–11.9 µg/m³. Ozone is represented by a single recent measurement of 33 µg/m³ at the university site.

The data set is relatively fresh – all seven rows are classified as updated within the past week, and no older or unknown‑timestamp entries appear. However, coverage is uneven: while NO₂, PM10 and PM2.5 each have two recent readings from the roadside station, ozone is only captured at the university location, giving a single point of reference for that pollutant. Consequently, city‑wide conditions may differ across neighborhoods and times of day, and the current snapshot reflects only the locations and moments recorded on 2026‑02‑10.

Learn more about sources and filtering: About the data.

Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)

Latest sensor values (bars)

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

Data notes

The data shown reflects seven valid measurements and is refreshed regularly, having been updated within three days (last update: 2026‑02‑10 20:00 UTC). This snapshot provides a current view of Leicester’s air quality but should be interpreted as an overview only; conditions can differ across neighbourhoods and change throughout the day.

OpenAQ station rows