Air quality in Welwyn Hatfield, England, United Kingdom today

Mr. Duck’s Air Quality Score

Good air today for Welwyn Hatfield, 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 Welwyn Hatfield today is classified as Good. The primary pollutant identified for the current assessment is PM2.5 (fine particles).

Measurements from five valid monitoring points show a PM2.5 concentration of 3.186 micrograms per cubic metre. No PM10 value is available for this period. 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 dataset for Welwyn Hatfield contains measurements from a single monitoring site in Welwyn Garden City, providing five rows of recent observations. All five pollutants are represented: PM1 at 0.586 µg/m³, PM2.5 at 3.186 µg/m³, relative humidity at 67.22 %, temperature at 13.29 °C, and particle count (UM003) at 252.98 particles/cm³. Each value is identical across its minimum, median and maximum, indicating that only one reading per pollutant is currently available.

The most recent timestamp for every measurement is 2026-02-10 21:00 UTC, which falls within the “updated within 7 days” freshness category. Because all pollutants share this single update time, there is no temporal spread to illustrate short‑term variability; the data reflects a snapshot rather than an ongoing series.

With only one station contributing, coverage across Welwyn Hatfield is limited to that specific location, so conditions elsewhere in the borough may differ from what is shown here. The uniformity of the values (no range beyond the single reading) means there is no observable dispersion for any pollutant at this time. Consequently, while the data is recent and technically complete for the listed contaminants, its spatial and temporal depth is narrow, offering a concise but limited picture of current air quality in Welwyn Hatfield.

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 for Welwyn Hatfield is based on five valid measurements and was refreshed within three days, with the most recent update recorded at 2026‑02‑10T21:00:00+00:00. This snapshot reflects conditions at a specific time and place; air quality can differ across neighbourhoods and change throughout the day, so values may not represent every location or moment in the city.

OpenAQ station rows