Randolph Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Randolph, New Jersey, nestled within Morris County, presents a fascinating interplay of geography and urban development impacting its air quality. Located at 40.8434° N, -74.5819° W, the township occupies a portion of the New Jersey Highlands, a region characterized by rolling hills and forested landscapes. The terrain is varied, with elevations ranging from approximately 700 to over 1,000 feet above sea level, influencing local wind patterns and pollutant dispersion. Randolph isn’t directly on a major waterway, but is within the watershed of several tributaries feeding the Passaic River, a crucial element in regional hydrology. The surrounding landscape is a mix of suburban residential areas, preserved woodlands, and scattered agricultural land, particularly horse farms. Its proximity to the New York Metropolitan Area and the industrial corridors of northern New Jersey introduces a significant source of transported pollutants. The urban-rural gradient is noticeable; while Randolph maintains a relatively low-density character, it experiences the effects of regional air pollution originating from more densely populated and industrialized areas to the east and south. This positioning means Randolph’s air quality is not solely determined by local emissions, but also by prevailing winds and long-range transport of pollutants. The Highlands Act aims to protect the area’s water and air resources, but regional pressures remain.

Randolph’s air quality follows a distinct seasonal pattern. Spring in Randolph often sees moderate pollution levels as temperatures rise and vehicle use increases after winter, coupled with agricultural activity. Pollen counts are also high, exacerbating respiratory issues. Summer typically brings better air quality due to increased atmospheric mixing and prevailing winds that help disperse pollutants, though ozone formation can be a concern on hot, stagnant days. August often presents the lowest pollution levels. Fall witnesses a resurgence of particulate matter as leaves decompose and heating systems begin operation. November can be particularly challenging. Winter is often the period of poorest air quality. Temperature inversions, common in the Highlands during cold, calm periods, trap pollutants near the ground, leading to localized build-ups. Wood burning for heating contributes significantly to particulate matter concentrations. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these inversion events. January and February are typically the months with the greatest risk. Monitoring wind direction is crucial; pollutants from the south and east will impact Randolph more directly. Staying indoors on high-pollution days and using air purifiers are recommended.