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Highlands, New York, nestled within the broader New York-Newark-Jersey City Metropolitan Area, occupies a geographically significant position along the western edge of Orange County. Its coordinates (41.3601, -74.0084) place it within the Appalachian foothills, characterized by gently rolling terrain and elevations that gradually increase eastward. The town’s proximity to the Delaware River, though not directly on its banks, influences regional weather patterns and contributes to localized humidity. The surrounding landscape is a blend of rural farmland, forested areas, and suburban development, creating a gradual urban-rural gradient. To the west, agricultural zones dominate, contributing potential sources of particulate matter from farming activities, particularly during harvest seasons. Further east, the urban sprawl of the New York metropolitan area exerts an influence, with potential for transported pollutants from industrial belts and major roadways. The region's climate is humid subtropical, experiencing warm, moist summers and cold, snowy winters. This climate, combined with the topography, can lead to temperature inversions during the colder months, trapping pollutants near the ground. The relatively small population of Highlands (12,894) suggests a primarily residential character, though its location within a major metropolitan area means it is not isolated from broader regional pollution sources. The prevailing winds, generally from the southwest, can carry pollutants from industrial areas to the northeast, impacting local air quality. The town's location within the Hudson River watershed also means that water quality can indirectly influence air quality through aerosol formation.

Highlands’ air quality experiences a distinct seasonal cycle dictated by meteorological conditions. Spring brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, pollen counts surge, impacting respiratory health, particularly for allergy sufferers. Summer months, while generally offering better air quality due to increased wind and convective mixing, can be punctuated by periods of stagnant air, especially during heatwaves, leading to ozone formation. The humidity also contributes to the formation of ground-level ozone. Autumn presents a mixed bag. While winds remain relatively strong, agricultural activities, such as harvesting and tilling, can release particulate matter into the air. The cooler temperatures can also lead to localized fog, trapping pollutants near the ground. The most challenging period for air quality is typically late fall and winter. Cold, stable air masses frequently settle over the region, creating temperature inversions where a layer of warm air sits above cooler air near the ground. This inversion prevents vertical mixing, trapping pollutants—primarily from vehicle emissions and residential heating—near the surface. Periods of calm winds exacerbate this issue. Sensitive groups, including children, the elderly, and individuals with respiratory conditions like asthma, should limit outdoor exertion during these periods. Early mornings and evenings are often the worst times. During the warmer months, limiting strenuous outdoor activity during peak ozone hours (typically midday) is advisable. Overall, the shoulder seasons (spring and fall) require vigilance, as they present a combination of pollen and particulate matter concerns.