Westwood Air Quality Index (AQI)

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Westwood, Massachusetts, is a suburban town nestled within Norfolk County, approximately 20 miles southwest of Boston. Its geography is characterized by gently rolling hills, a legacy of glacial activity during the last ice age, resulting in a varied terrain with pockets of wetlands and forested areas. The town’s elevation ranges from around 160 to 300 feet above sea level. This relatively low elevation, combined with its inland position, influences local air quality. Westwood isn’t directly on the coast, but is influenced by prevailing winds off the Atlantic, which can transport pollutants from the Boston metropolitan area and even further afield. Surrounding Westwood are a mix of landscapes: to the north, denser urban and suburban development extends towards Boston; to the south and west, a more rural character prevails with agricultural lands and forested areas. The urban-rural gradient is therefore significant, with potential for pollutant dispersion from the city but also susceptibility to regional transport. Historically, the area supported some light industrial activity, though this has largely transitioned to commercial and residential use. The presence of Interstate 95 bisecting the town introduces a concentrated source of vehicular emissions, directly impacting local air quality.

Westwood experiences a distinct four-season climate, profoundly impacting air quality. Spring brings increased pollen counts, exacerbating respiratory issues, alongside moderate temperatures and occasional stagnant air masses that trap pollutants. Summer typically sees better air quality due to increased atmospheric mixing and prevailing winds, though ozone formation can be a concern on hot, sunny days, particularly in July and August. These months are generally favourable for outdoor activity, but sensitive individuals should monitor conditions. Autumn offers crisp, clear air as temperatures cool and winds pick up, dispersing pollutants. However, wood smoke from residential heating becomes a noticeable contributor to particulate matter. Winter is often the period of poorest air quality. Cold temperatures lead to increased reliance on fossil fuel heating, and temperature inversions – where a layer of warm air traps cooler air near the surface – are common, concentrating pollutants. January and February are typically the months to avoid strenuous outdoor activity. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit exposure during these periods and consider using air purifiers indoors. Fog can also trap pollutants, reducing visibility and worsening air quality.