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Santa Anita, Sonora, nestled within the Yaqui Valley, occupies a geographically significant position in northwestern Mexico. Located at approximately 30.51° N, 111.12° W and an elevation of roughly 250 meters (820 feet) above sea level, the town benefits from a relatively flat terrain characteristic of the valley floor. This topography, however, presents challenges for air quality dispersion. The surrounding landscape is dominated by agricultural lands – the Yaqui Valley is a major producer of wheat, alfalfa, and various fruits – contributing to potential particulate matter from farming practices, particularly during harvest seasons. To the east, the Sierra Madre Occidental mountains rise, creating a barrier that can trap pollutants, especially during periods of low wind. While Santa Anita lacks direct proximity to large bodies of water, the Yaqui River flows nearby, influencing local humidity and potentially affecting the behaviour of atmospheric pollutants. The urban–rural gradient is gradual; Santa Anita is a relatively small town, transitioning quickly into agricultural fields and smaller rural settlements. There's limited heavy industry directly within Santa Anita itself, but the broader Sonora region, including Hermosillo, has industrial zones that could contribute to transboundary pollution events. The valley's enclosed nature, combined with agricultural activity and potential upwind industrial emissions, makes Santa Anita susceptible to localized air quality issues, particularly concerning particulate matter and agricultural emissions. The prevailing winds, generally from the west, can carry pollutants from the mountains or distant industrial areas into the valley.

Santa Anita’s air quality experiences a distinct seasonal pattern dictated by its semi-arid climate and agricultural cycles. The dry season, typically spanning from March to June, often sees the poorest air quality. High temperatures and minimal rainfall create stable atmospheric conditions, frequently leading to temperature inversions where a layer of warm air traps cooler air (and pollutants) near the ground. Agricultural burning, a common practice for land clearing and crop residue disposal, intensifies during this period, significantly increasing particulate matter concentrations. July through September marks the onset of the monsoon season, bringing increased rainfall and more frequent wind shifts. These conditions generally improve air quality by dispersing pollutants and washing particulate matter from the atmosphere. However, intense storms can also stir up dust, temporarily degrading air quality. October and November see a gradual return to drier conditions, with a slow increase in particulate matter as agricultural activity ramps up again in preparation for the next planting season. December and February represent a transitional period, with variable weather patterns. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during agricultural burning periods. Limiting outdoor exertion and monitoring local conditions are advisable. The monsoon season offers a respite, but vigilance regarding dust storms remains important. Overall, minimizing exposure during the hottest, driest months is crucial for respiratory health.