Air quality in Hà Nội, Vietnam today

Mr. Duck’s Air Quality Score

Unhealthy air today for Hà Nội, Vietnam

⚠️ 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 Hà Nội is currently classified as Unhealthy. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 60.28 µg/m³ and a PM10 level of 113.43 µg/m³, based on 13 valid observations collected via OpenAQ.

These values reflect the present conditions for the city. 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 Hanoi air‑quality dataset currently includes six measured pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤10 µm (PM10), particulate matter ≤2.5 µm (PM2.5) and sulfur dioxide (SO₂). Across the city there are 161 individual measurement rows coming from 40 distinct monitoring stations, so each pollutant is not necessarily represented at every site. The most recent observations were recorded on 2026‑02‑10 for PM2.5, NO₂, PM10, O₃ and SO₂ (all logged between 16:45 and 19:20 UTC), while CO’s latest reading dates back to 2026‑02‑03 03:00 UTC, indicating a slightly older data stream for that gas.

The concentration values show a wide spread. For PM2.5 the median is 27 µg/m³ with individual readings ranging from as low as 5.9 µg/m³ up to 72.0 µg/m³ at the most polluted site (556 Nguyễn Văn Cừ). CO exhibits a much higher variability, with a median of 735 µg/m³ and extremes between 0.8 µg/m³ and 4 120 µg/m³; the latest reported value is 582 µg/m³ at Minh Khai – Bắc Từ Liêm. NO₂ values are generally lower, clustering around a median of 21.5 µg/m³ and spanning from zero to 73.9 µg/m³, while PM10’s median sits at 37 µg/m³ with a range of 1 to 139 µg/m³. O₃ concentrations are modest, median 11 µg/m³, minimum 1.24 µg/m³ and maximum 27.2 µg/m³; SO₂ is the least variable, median 1.75 µg/m³, ranging from 0.64 to 33.0 µg/m³.

Overall, most pollutants have fresh data updated within the last month, but CO’s latest timestamp is a week older than the others, and only five stations currently report O₃ and SO₂. This uneven coverage means that while the dataset gives a useful snapshot of Hanoi’s air quality at several locations, conditions can differ across neighborhoods and times not captured by the existing sensor network.

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 13 valid measurements and is updated within 30 days, with the most recent reading recorded on 2026‑02‑10 at 19:20 UTC. This snapshot provides a brief overview of current conditions; however, air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in Hà Nội.

OpenAQ station rows