Air quality in Masaki, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Masaki, Japan

⚠️ 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 Masaki today falls into the Moderate category according to OpenAQ data. The primary pollutant identified is PM2.5, with a measured concentration of 19.0 µg/m³.

Only one valid measurement was recorded for this assessment, and no PM10 value is available. 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 current station data listed for this city is focused on particulate matter (PM). Only PM2.5 measurements are available, coming from two sensor rows that both report the same pollutant. The newest reading was recorded on 2026-02-10 22:00 UTC, so the freshest data is less than three days old, while there is one older entry and no unknown‑age records.

Across the two stations the PM2.5 values range from a minimum of 12.0 µg/m³ to a maximum of 19.0 µg/m³, with a median of 15.5 µg/m³ and the 10th percentile at about 12.7 µg/m³ and the 90th percentile near 18.3 µg/m³. This indicates that most recent observations cluster in the mid‑teens, but the spread between low and high readings is roughly seven micrograms per cubic metre. Because only two rows contribute data, coverage is limited to a single location (伊予郡松前町大字北黒田119-2) and does not capture possible variation across other parts of Masaki. Consequently, while the available figures are recent, they represent a narrow snapshot rather than a comprehensive city‑wide picture.

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 current reading for Masaki is based on a single valid measurement and was refreshed recently, Updated within 3 days (last update: 2026‑02‑10T22:00:00+00:00). This snapshot reflects conditions at the time of sampling; air quality can vary across different neighborhoods and times of day within the city.

OpenAQ station rows