Outdoor
Current values look suitable for ordinary outdoor activity for most people.
Why: Low AQI and low pollutant levels support this guidance.
Boston, Massachusetts, United States
Boston air quality today
Current values look suitable for ordinary outdoor activity for most people.
Data: Hourly Open-Meteo model estimateThe latest update is older than expected, so this page is showing an estimate for the current hour.Detailed metrics and guidance use the latest available detailed data.
Practical guidance
Running
Current values look suitable for an easy outdoor run.
Why: Low AQI and low pollutant levels support this guidance.
Ventilation
Consider waiting before longer ventilation.
Why: PM2.5, PM10, NO2 or ozone is elevated, so longer ventilation may bring more outdoor pollution indoors.
Air quality and outdoor metrics
US AQI
Air Quality Index
36
Good
PM2.5
Fine particulate matter
9.1µg/m³
Low
PM10
Coarse particulate matter
10.2µg/m³
Low
NO₂
Nitrogen dioxide
26µg/m³
Low
O₃
Ozone
46µg/m³
Low
UV index
Sun exposure level
0
Low
Temperature
Air temperature
18°C
Comfortable
Feels like
Apparent temperature
18°C
Comfortable
Wind
Wind speed
10km/h
Light
Humidity
Relative humidity
77%
Humid
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Disclaimer
This information is a general estimate only and is not medical advice.
Location
Boston, United States
Coordinates: 42.3601, -71.0589 · America/New_York
Interpret AQI for outdoor activity
Calculic's European AQI calculator assesses the value using your population group and planned activity intensity.
Interpret AQI in CalculicThis page's European AQI value, city and timestamp are passed to the calculator through the link.
What affects air quality in Boston
Boston's Air Pollution Control Commission says its Downtown, South Boston and East Boston parking freezes reduce car-related air pollution by limiting off-street parking.
This describes a city traffic-management program and its stated purpose, not current air quality in the three areas.
Local monitoring and context
Boston reports three EPA monitoring stations in the city and separate streetlight sensors along Cummins Highway and Columbus Avenue for roadway-reconstruction studies.
The regulatory stations and corridor sensors have different purposes; neither is presented as the source of this page's current AQI or as uniform citywide coverage.
City air quality FAQ
How should I read the AQI for Boston?
US AQI condenses air quality into one value. On this page, it helps you quickly judge whether conditions look good, moderate or more polluted than usual.
Is the air quality good for going outside?
Check the outdoor and running cards first. They combine AQI, particles, ozone, weather and other factors that can affect outdoor comfort.
Should I ventilate right now?
The ventilation card considers AQI and pollutants such as particles, nitrogen dioxide and ozone. If values are elevated, a shorter opening or a later moment may be better.
Why can air quality change during the day?
Weather, emissions, ozone formation, particles and air flow can shift local conditions, so the next hours can differ from the current reading.
Sources and methodology
Current data
This page uses US AQI.
Current and hourly air-quality values are CAMS-based model estimates, not measurements from a local monitoring station. They may not reflect street-level conditions.
- Displayed state
- This hour's model estimate
- Data time
- 5 Sept 2026, 09:00 pm
- Data source
- Open-Meteo
The latest update is older than expected, so this page is showing an estimate for the current hour.
Detailed metrics and guidance use the latest available detailed data.
Evergreen city statements
Each local statement is linked to a checked primary-authority source. A source check is editorial provenance and does not describe current-data freshness.
Local sources support the background claims below; they are not the source of the current data shown above unless explicitly stated otherwise.
Authoritative sources for local statements
Air Pollution Control Commission
City of Boston
- Scope
- Boston
- Source checked
- 22 Aug 2026
The Parking Freezes section states that the program limits off-street parking to reduce air pollution caused by cars.
Applicability: City program description for the three named parking-freeze areas; it is not a current air-quality measurement.
Based on this source: Boston's Air Pollution Control Commission says its Downtown, South Boston and East Boston parking freezes reduce car-related air pollution by limiting off-street parking.
Clean Air in Boston
City of Boston
- Scope
- Boston
- Source checked
- 22 Aug 2026
The page identifies three EPA stations and describes streetlight-sensor deployments on Cummins Highway and Columbus Avenue.
Applicability: City monitoring overview; the EPA stations and project sensors are separate systems with different data-quality and study roles.
Based on this source: Boston reports three EPA monitoring stations in the city and separate streetlight sensors along Cummins Highway and Columbus Avenue for roadway-reconstruction studies.