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Primary air pollutant in the Waltham area:
OZONE - 24 Good
Enjoy your outdoor activities.
Other Pollutants:
PM2.5 - 22 Good
PM10 - 16 Good
Primary Pollutant: PM2.5 - 0 Good
Primary Pollutant: PM2.5 - 60 Moderate
Primary Pollutant: PM2.5 - 0 Good