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Brookhaven, New York, occupies a distinctive position on Long Island's South Shore, where its geography creates a complex air quality environment shaped by both natural and urban factors. Situated at approximately 40.8°N latitude, the town spans diverse terrain from coastal plains to gentle uplands, with elevations ranging from sea level along the Atlantic coastline to about 100 feet inland. This coastal proximity means Brookhaven experiences marine influences that can disperse pollutants but also trap them under certain conditions. The town lies within the New York metropolitan area's eastern fringe, creating an urban-rural gradient where dense suburban development in western sections transitions to more preserved landscapes in the Pine Barrens region to the east. Brookhaven's location places it downwind of New York City's industrial and transportation emissions, which frequently drift eastward on prevailing westerly winds. The surrounding landscape includes the Great South Bay to the south, which moderates temperatures but can contribute to humidity and fog formation, and agricultural zones in eastern Suffolk County that occasionally add particulate matter from soil management. The town's position within Long Island's industrial belt—with nearby power plants, the Brookhaven National Laboratory, and transportation corridors like the Long Island Expressway—creates multiple local pollution sources. This geography, combined with the region's dense population of nearly 500,000, results in air quality that reflects both regional transport and local emissions, particularly during stagnant weather patterns when the town's relatively flat terrain offers little topographic relief to enhance dispersion.

Brookhaven's air quality follows a distinct seasonal pattern influenced by Long Island's temperate climate and meteorological conditions. In winter, cold temperatures increase heating demand, elevating emissions from residential and commercial sources, while temperature inversions—common during calm, clear nights—trap pollutants near the surface, particularly in January and February. Sensitive groups should monitor air quality forecasts during these months and limit prolonged outdoor exertion on still days. Spring brings improving conditions as increasing sunlight and more frequent frontal systems enhance atmospheric mixing, though pollen from the region's abundant vegetation can exacerbate respiratory issues in April and May. Summer presents the most variable air quality: while sea breezes from the Atlantic often provide natural ventilation, high-pressure systems can create stagnant conditions where ozone forms from precursor pollutants under intense sunlight, typically peaking in July and August. These episodes are most concerning for children, older adults, and those with lung conditions, who should schedule outdoor activities for morning hours when ozone levels are lower. Autumn generally offers the cleanest air, with crisp winds from the northwest sweeping away pollutants and reduced sunlight limiting ozone formation, making September through November ideal for outdoor recreation. However, occasional wildfire smoke from distant regions can drift into the area during dry periods. Throughout the year, Brookhaven's coastal location means fog and humidity can occasionally trap particulates, particularly during transitional seasons when temperature differences between land and water are greatest.