Worst air pollution Weymouth, today and tomorrow
Today (16 July): Air quality in Weymouth is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 PM (O3: 36.0/100).
Tomorrow (17 July 2026): Air quality in Weymouth is fair. AQI improves to medium; NO2 decreases to medium; all other pollutants stay as today. Pollution peaks around 9:00 PM (NO2: 40.4/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Weymouth's air quality in Massachusetts reflects the South Shore coastal position in Norfolk County, with vehicle emissions from SR-3 and the surrounding mixed residential and commercial character contributing local sources. Massachusetts Bay maritime breezes provide ventilation from the east, while the broader Boston metropolitan regional ozone burden on prevailing southwesterlies elevates background pollution above the southeastern Massachusetts coastal baseline and the flat South Shore terrain allows reasonable dispersal throughout the year.
Today - 16 July | Pollution peaks at 13:00
AQI:
Fair
36.0/100
PM2.5 (fine particles):
Good
15.5/100
PM10 (coarse particles):
Good
16.6/100
NO2 (nitrogen dioxide):
Fair
27.3/100
O3 (ozone):
Fair
36.0/100
SO2 (sulfur dioxide):
Good
2.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.1/100
PM1 (ultrafine particles):
Good
7.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 21:00
AQI:
Medium
40.4/100
PM2.5 (fine particles):
Good
11.4/100
PM10 (coarse particles):
Good
7.1/100
NO2 (nitrogen dioxide):
Medium
40.4/100
O3 (ozone):
Fair
37.9/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.3/100
PM1 (ultrafine particles):
Good
7.4/100
Pollen forecast in Weymouth
View pollen forecastFrequently Asked Questions
Is air quality bad in Weymouth right now?
On 16 July 2026, overall air quality in Weymouth is fair. AQI is the main air quality indicator at 36.0/100. Pollution peaks around 1:00 PM (O3: 36.0/100).
Will air quality be worse tomorrow in Weymouth?
On 17 July 2026, air quality conditions in Weymouth will be similar to today, with O3 forecast at fair at 37.9/100. Pollution peaks around 9:00 PM (NO2: 40.4/100).
When is air pollution at its worst in Weymouth?
Weymouth sees air quality change through the year. Typically, the cleanest conditions typically arrive with the more unsettled weather of spring and autumn, while hot, humid summer days bring the highest ozone risk, often worsened by pollution transported in from other regions. Coastal sea breezes can offer some relief from inland summer ozone buildup.
Are air quality levels in Weymouth based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app