Air quality in Bunkyō, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Bunkyō, 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 Bunkyō today falls into the Moderate category according to OpenAQ data. The primary pollutant identified is PM2.5, with a measured concentration of 16.0 µg/m³ based on eight valid observations.

These measurements reflect the current state of fine particulate matter in the area without additional context or interpretation. 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 Bunkyō dataset currently contains four measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), combined nitrogen oxides (NOX) and fine particulate matter (PM2.5). All of these values come from two monitoring stations, each providing a pair of recent readings, for a total of eight recent rows in the OpenAQ feed. The most recent update across all pollutants was recorded on 2026-02-10 at 22:00 UTC, so the data are fresh within the last three days.

For NO the observed concentrations range from a low of 0.002 ppm to a high of 0.017 ppm, with a median value of about 0.0095 ppm and the middle 80 % of readings falling between roughly 0.0035 ppm (10th percentile) and 0.0155 ppm (90th percentile). NO₂ shows a tighter spread, varying between 0.016 ppm and 0.028 ppm; its median is 0.022 ppm and the inter‑percentile range runs from 0.0172 ppm to 0.0268 ppm. NOX values are broader, from 0.018 ppm up to 0.045 ppm, with a median of 0.0315 ppm and an 80 % span of 0.0207–0.0423 ppm. PM2.5 measurements are expressed in micrograms per cubic metre and range narrowly between 14.0 µg/m³ and 16.0 µg/m³, the median sitting at 15.0 µg/m³ and the central 80 % of values lying between 14.2 µg/m³ and 15.8 µg/m³.

Because only two stations contribute data, spatial coverage within Bunkyō is limited; conditions can differ across neighborhoods that are not directly represented by these sensors. Nevertheless, the dataset provides a recent snapshot with all four pollutants reported at the same location (文京区大塚３－５－１) and timestamps that are uniformly fresh, allowing for an up‑to‑date view of air quality at those points in the city.

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 reflect eight valid measurements and were updated within 3 days, with the latest refresh recorded at 2026‑02‑10T22:00:00+00:00. This snapshot provides a current view of air quality in Bunkyō, but conditions can differ across neighborhoods and change throughout the day, so values may not represent every location or moment within the city.

OpenAQ station rows