Air quality in Lohja, Uusimaa, Finland today

Mr. Duck’s Air Quality Score

Good air today for Lohja, Uusimaa, Finland

⚠️ 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 Lohja today falls into the Good category. The main pollutant measured is PM2.5 (fine particles). According to OpenAQ data, the PM2.5 concentration is 8.52 µg/m³ and the accompanying PM10 level is 10.32 µg/m³, based on six valid measurements.

These values indicate that particulate matter levels are within the range associated with a Good rating for this location. 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 air‑quality data for Lohja currently includes three measured pollutants – nitrogen dioxide (NO₂), particulate matter 10 µm or smaller (PM₁₀) and fine particulate matter 2.5 µm or smaller (PM₂.₅). All values come from the OpenAQ network and are reported by two monitoring stations, giving a total of eight recent readings across the city. Six of those rows have been updated within the last three days, while the remaining two are older than three days but still less than thirty days old; none are marked as “today” or unknown.

For PM₁₀ the most recent measurement is 10.31592 µg/m³ recorded at Lohja Harjula on 2026‑02‑10 18:00 UTC, with a minimum observed value of 5.97923 µg/m³ and both median and maximum equal to the same 10.31592 µg/m³. PM₂.₅ shows a latest reading of 8.520288 µg/m³ at the same site and time, ranging from a low of 3.196193 µg/m³ up to that same median‑maximum figure. NO₂ is reported only once in the recent set: 16.18466 µg/m³ at Lohja Harjula on 2026‑02‑10 18:00 UTC, with no variation among the available rows.

The dataset therefore provides a fairly fresh snapshot for all three pollutants, though the number of observations differs – PM₁₀ and PM₂.₅ each have multiple recent entries allowing an assessment of range, while NO₂ is represented by a single recent value. The spread between minimum and maximum values is larger for the particulate matter metrics than for NO₂, indicating more variability in particle concentrations across the limited sampling period. Because only two stations contribute data, conditions can still differ in other parts of Lohja or change outside the times captured here.

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 Lohja are based on six valid measurements and were updated within three days, with the latest refresh recorded at 2026‑02‑10 18:00 UTC. These values represent a brief snapshot of conditions across the city; air quality can differ by specific location and time of day, so individual experiences may vary from the figures presented here.

OpenAQ station rows