Randolph Air Quality Index (AQI)

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Randolph, Massachusetts, is situated in Norfolk County, approximately 15 miles south of Boston and 20 miles northeast of Providence, Rhode Island. Its coordinates (42.1778, -71.0539) place it within the coastal plain of Massachusetts, characterized by relatively flat terrain with gentle rolling hills. The elevation averages around 138 feet above sea level, contributing to limited natural dispersion of pollutants. The town’s proximity to the Atlantic Ocean, roughly 5 miles east, introduces maritime influences on local weather patterns, including sea breezes that can both dilute and concentrate pollutants depending on atmospheric conditions. Randolph experiences a moderate urban-rural gradient; while not heavily industrialized itself, it’s within commuting distance of Boston’s industrial and commercial centers, and benefits from, and is impacted by, regional transportation networks. Surrounding Randolph are a mix of residential areas, light commercial development, and pockets of preserved agricultural land, particularly to the south and west. The Massachusetts Turnpike (I-93) bisects the town, acting as a significant corridor for vehicle emissions. This combination of factors – coastal proximity, moderate elevation, regional industrial influence, and highway traffic – creates a unique geographic context influencing Randolph’s air quality.

Randolph’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees elevated particulate matter from road salt residue and agricultural activity as fields are prepared. Pollen counts are also high, impacting those with allergies. Summers (June-August) generally offer the best air quality, benefiting from prevailing westerly winds and increased atmospheric mixing, though ozone formation can be a concern on hot, stagnant days. August is often the most favourable month for outdoor activity. Autumn (September-November) brings a return of stagnant air masses and potential temperature inversions, trapping pollutants near the ground, particularly vehicle emissions as school and commuting traffic increases. Wood smoke from residential heating also becomes a factor. Winter (December-February) is typically the period of poorest air quality. Reduced sunlight hours limit ozone breakdown, and temperature inversions are frequent, exacerbating concentrations of particulate matter and carbon monoxide from heating sources. Cold, calm days in January and February are particularly challenging. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these periods and monitor local air quality reports.