Air quality in Boston, Massachusetts, United States of America today

Mr. Duck’s Air Quality Score

Moderate air today for Boston, Massachusetts, United States of America

⚠️ 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

Today's air quality in Boston is classified as Moderate. The primary pollutant identified is PM2.5. The measured PM2.5 concentration is 10.3 µg/m³, while PM10 stands at 63.0 µg/m³. The assessment incorporates 24 valid measurement points taken throughout the monitoring period. All readings are aggregated to produce the overall category. Data is shown via OpenAQ.

These values reflect the latest set of readings collected across the city. The PM2.5 value of 10.3 µg/m³ reflects fine particulate matter that is commonly monitored in urban environments. No additional pollutants dominate the current assessment. No other pollutant exceeds the thresholds used for the current classification. 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 Boston air‑quality feed pulls data from 55 monitoring rows, of which 40 are classified as recent and 15 as older. Twenty‑five rows have been updated within the last 30 days, nine are older than that and six lack a timestamp, so the overall picture is fairly current but not uniformly fresh. The dataset includes measurements for carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO₂), nitrogen oxides (NOX), ozone (O₃), particulate matter 1 µm (PM₁), particulate matter 10 µm (PM₁₀), particulate matter 2.5 µm (PM₂.₅), relative humidity, sulfur dioxide (SO₂), temperature and a sensor labeled UM003. In practice, the most recent timestamps are for PM₂.₅ (2026‑02‑11 00:00 UTC), NO, NO₂, NOX, PM₁₀, CO and SO₂ (all 2026‑02‑10 23:00 UTC), while the PM₁ reading dates back to 2026‑02‑01 08:00 UTC; O₃, relative humidity, temperature and UM003 have no recent rows in this extract.

Across the available pollutants the data show a modest spread. PM₂.₅ values range from 0.26 to 19.8 µg/m³ with a median of 7.66 µg/m³, and the single reported value for Boston‑Chinatown on the latest date is 10.3 µg/m³. NO concentrations sit between 0.003 and 0.01 ppm, median 0.009 ppm, with the newest reading of 0.003 ppm recorded in Roxbury. CO is measured between 0.3 and 0.5 ppm (median 0.4 ppm) and SO₂ between 0.0001 and 0.0007 ppm (median 0.0004 ppm), both also from Roxbury on the most recent update. PM₁₀ shows a broader distribution, from 0 to 63 µg/m³, median roughly 30 µg/m³, and the highest recent value of 63 µg/m³ comes from Roxbury. PM₁ data are limited to two rows, both reporting zero, indicating either very low concentrations or a lack of detection at those sites.

Because the number of stations varies by pollutant—four for PM₂.₅, three each for NO, NO₂, NOX, PM₁₀, CO and SO₂, and only two for PM₁—spatial coverage is uneven. Consequently, while the recent timestamps give a timely snapshot for many key gases and particles, gaps remain for ozone, humidity, temperature and the UM003 sensor, meaning city‑wide conditions can differ by location and time.

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

This dataset includes 24 valid measurements and is updated within 30 days. The most recent data were recorded on 2026-02-11T00:00:00+00:00. Air quality can vary by location and time within the city, so this snapshot may not reflect conditions everywhere. Users should consider local factors and consult additional sources for detailed, real‑time information.

OpenAQ station rows