Air quality in Changhua City, Taiwan today

Mr. Duck’s Air Quality Score

Moderate air today for Changhua City, Taiwan

⚠️ 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 Changhua City is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 19.0 µg/m³ and a PM10 level of 30.0 µg/m³, based on six valid observations collected through OpenAQ.

These values reflect the present conditions without implying any trend or cause. 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 Changhua City contains six individual measurement rows, one for each of the six pollutants tracked by OpenAQ: carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤10 µm (PM₁₀), particulate matter ≤2.5 µm (PM₂.₅) and sulfur dioxide (SO₂). All rows come from the same monitoring site, listed as “彰化縣 – 彰化”, so coverage is limited to a single location rather than a network of stations across the city.

Each pollutant shows a single recorded value that also serves as its minimum, median and maximum for the period covered. CO registers at 0.42 ppm, NO₂ at 0.021 ppm, O₃ at 0.009 ppm, PM₁₀ at 30.0 µg/m³, PM₂.5 at 19.0 µg/m³ and SO₂ at 0.0014 ppm. Because the data set contains only one observation per pollutant, there is no spread or variability to report; the typical (median) concentration equals the observed value for every component.

All six measurements were last updated on 2026-02-10 23:00 UTC, which falls within the “updated within 7 days” freshness bucket. This indicates that the most recent data are relatively current, but the overall picture is constrained by the single‑site, single‑time snapshot. Consequently, while the numbers give a clear view of conditions at that specific monitoring point on the recorded date, they do not capture spatial or temporal variations that may exist elsewhere in Changhua 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 reflects six valid measurements and is updated within 3 days, with the most recent reading recorded at 2026‑02‑10T23:00:00+00:00. These values provide a current snapshot of air quality for Changhua City, but conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured in this summary.

OpenAQ station rows