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Nestled in the northeastern reaches of the Phoenix metropolitan area, Scottsdale occupies a distinctive position within Arizona's Sonoran Desert. The city sprawls across the Salt River Valley, with its urban core situated at approximately 380 meters (1,250 feet) above sea level, a modest elevation that nonetheless influences local climate patterns. To the north and east, the McDowell Mountains and other rugged foothills of the Tonto National Forest create a natural boundary, while to the south and west, the city merges seamlessly into the broader Phoenix urban fabric. This location within the Valley of the Sun places Scottsdale in a basin surrounded by mountain ranges, a topographic configuration that significantly impacts air quality by trapping pollutants under frequent temperature inversions, particularly during cooler months. The city's proximity to the Salt River, though often dry, and the nearby canals do little to mitigate the arid conditions that dominate. Scottsdale's urban character is marked by low-density, automobile-dependent development interspersed with luxury resorts, golf courses, and preserved desert open spaces, creating a patchwork that reduces some industrial emissions but contributes to vehicle-dependent pollution. The region lacks major heavy industry within city limits, but its position downwind from Phoenix's urban core and occasional agricultural activities in surrounding Maricopa County means it shares in the basin's collective air quality challenges, with pollutants often accumulating across the metropolitan area under stagnant atmospheric conditions.

Scottsdale's air quality follows a pronounced seasonal rhythm shaped by its desert climate and monsoon patterns. In winter, from December through February, cool temperatures and frequent temperature inversions trap pollutants near the ground, leading to elevated levels of particulate matter (PM2.5 and PM10) and occasional spikes in nitrogen oxides from vehicle emissions; this period often sees the year's worst air quality, making it advisable for sensitive groups like those with respiratory conditions to limit prolonged outdoor exertion. Spring, from March to May, brings warmer temperatures and increased wind, which help disperse pollutants, though occasional dust storms from the surrounding desert can cause sudden deteriorations in air quality, particularly in April and May. Summer, from June to August, is dominated by the North American Monsoon, which typically arrives in July, bringing afternoon thunderstorms that cleanse the air through rainfall and increased mixing; however, high ozone levels can peak on hot, sunny days before storms, especially in June, due to intense sunlight reacting with vehicle and industrial emissions. Autumn, from September to November, offers generally favorable conditions as temperatures moderate and monsoon activity wanes, with October and November often providing the cleanest air of the year, ideal for outdoor activities. Throughout the year, sensitive individuals should monitor local air quality forecasts, as rapid changes can occur with dust events or temperature inversions, and consider indoor exercise during peak pollution periods.