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Lower, New Jersey, a small borough nestled within Mercer County, occupies a geographically significant position within the broader Delaware Valley region. Its coordinates (38.9819, -74.9087) place it on a relatively flat, alluvial plain formed by the receding glaciers of the last ice age. This terrain, characterized by fertile soils, historically supported agricultural activities, though today, Lower is increasingly integrated into the suburban sprawl surrounding Trenton, the state capital. The borough lies close to the Delaware River, a major waterway influencing local climate and potentially impacting air quality through the transport of pollutants from upriver sources. While not directly adjacent, the proximity to the heavily industrialized areas of northern New Jersey and the Philadelphia metropolitan area contributes to regional air pollution patterns. The urban–rural gradient is gradual; Lower transitions from residential neighborhoods to more agricultural land further west, with interspersed pockets of light industrial and commercial development. Elevation is minimal, rarely exceeding 150 feet above sea level, which can exacerbate the trapping of pollutants, particularly during periods of stable atmospheric conditions. The surrounding landscape is a mix of farmland, forested areas, and residential developments, all contributing to a complex interplay of emissions and dispersion patterns. The borough's location within the Piedmont Plateau also influences drainage patterns and the potential for localized flooding, which can temporarily affect air quality due to the release of volatile organic compounds from inundated soils.

Lower’s air quality experiences a distinct seasonal cycle driven by meteorological factors. Spring (March-May) often sees elevated levels of pollen, impacting respiratory health, alongside increased vehicle emissions as temperatures rise and more people venture outdoors. The transition months can be prone to temperature inversions, where a layer of warm air traps cooler air near the ground, hindering pollutant dispersion. Summer (June-August) typically brings warmer temperatures and occasional thunderstorms, which can temporarily cleanse the air, but prolonged heat waves can exacerbate ozone formation, a secondary pollutant created by sunlight reacting with vehicle exhaust and industrial emissions. Autumn (September-November) often presents the most challenging period, with stagnant air masses and frequent temperature inversions leading to pollutant accumulation. The cooler temperatures also contribute to increased use of residential heating systems, adding to particulate matter pollution. Winter (December-February) can offer periods of relatively cleaner air due to stronger winds and colder temperatures, but cold snaps often lead to increased wood-burning for heating, releasing particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should monitor local air quality reports and limit outdoor activity during periods of stagnant air or elevated pollution levels, particularly during autumn and early spring. Avoiding strenuous outdoor exercise during peak pollution times is also advisable. Residents are encouraged to reduce vehicle idling and consider alternative transportation options to minimize their contribution to local air pollution.