Air quality in Viterbo, Lazio, Italy today

Mr. Duck’s Air Quality Score

Good air today for Viterbo, Lazio, Italy

⚠️ 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 Viterbo today is classified as Good. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 7.0 µg/m³ and a PM10 reference value of 12.0 µg/m³, based on five valid observations.

Data are displayed via OpenAQ. 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 Viterbo air‑quality record draws on twelve data rows collected at two monitoring stations, covering eight pollutants: carbon monoxide (CO), nitrogen oxides (NO, NO₂, NOX), ozone (O₃), particulate matter (PM10 and PM2.5), and sulphur dioxide (SO₂). For most gases the latest observations are from 9 February 2026, with timestamps shown as 2026‑02‑09 03:00 UTC for CO and NO₂, and 2026‑02‑09 00:00 UTC for NO, NOX, PM10 and PM2.5. Ozone and sulphur dioxide are the exceptions; their most recent entries date back to 16 May 2024 (2024‑05‑16 13:00 UTC), so those two series are considerably older than the rest.

The CO values span a narrow band between 400 µg/m³ and 500 µg/m³, with a median of 450 µg/m³ and the 10th–90th percentile range from 410 to 490 µg/m³. NO₂ shows a much wider spread, ranging from 2 µg/m³ up to 26 µg/m³; its median sits at 14 µg/m³ while the central 80 % of readings lie between 4.4 and 23.6 µg/m³. By contrast, NO, NOX, PM10 and PM2.5 each have a single reported value (1 µg/m³ for NO, 7 µg/m³ for NOX, 12 µg/m³ for PM10 and 7 µg/m³ for PM2.5), indicating very limited variability in the available data.

Overall, the dataset is recent for half of the pollutants but older for ozone and sulphur dioxide, and it provides a modest number of observations per pollutant. Because only two stations contribute, conditions can differ across the city and over time, especially for those compounds with sparse or outdated records.

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 Viterbo reflects five valid measurements and is updated within three days, with the most recent reading recorded on 2026‑02‑09 at 03:00 UTC. These figures provide a snapshot of current conditions but air quality can differ across neighborhoods and change throughout the day, so local variations may not be captured in this summary.

OpenAQ station rows