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San José del Cabo, nestled on the southern tip of Baja California Sur, occupies a unique geographic position that significantly influences its air quality. The city sits on a narrow coastal plain, bordered by the Pacific Ocean to the west and the Sea of Cortés to the east, creating a microclimate characterized by sea breezes and relatively moderate temperatures. Its coordinates (23.0614, -109.7081) place it within a region dominated by arid and semi-arid landscapes, with the Sierra de la Laguna mountains rising dramatically to the east. This mountain range acts as a partial barrier, influencing wind patterns and occasionally trapping pollutants. The surrounding terrain is a mix of sandy beaches, rocky outcrops, and desert scrub, transitioning to more rugged terrain inland. The urban–rural gradient is relatively sharp; beyond the city limits, agriculture, primarily date palm cultivation and some aquaculture, becomes more prevalent. While San José del Cabo itself lacks major heavy industry, it serves as a service hub for the wider region, and occasional construction activity contributes to localized particulate matter. The proximity to the Sea of Cortés introduces marine influences, including salt spray and occasional fog, which can affect visibility and, to a lesser extent, air quality. The elevation is low, averaging around 10 meters above sea level, minimizing the potential for altitude-related air quality variations. The prevailing winds generally blow from the Pacific, but the complex topography can create localized variations, impacting pollutant dispersion.

San José del Cabo experiences a distinct wet/dry seasonal pattern, profoundly impacting its air quality. The dry season, spanning roughly October through May, is characterized by consistently sunny skies, low humidity, and prevailing Pacific breezes. While generally favorable for air quality, this period can see occasional spikes in particulate matter due to dust storms originating from the inland deserts, particularly during periods of strong Santa Ana-like winds. The wet season, from June to September, brings monsoon moisture and the potential for localized thunderstorms. While rainfall naturally helps to cleanse the atmosphere, the associated humidity can trap pollutants closer to the ground, especially during periods of reduced wind. Fog, common during the early morning hours in the wet season, further exacerbates this effect, limiting pollutant dispersion. Temperature inversions, though less frequent than in some other locations, can occur during the cooler months (November-February), trapping pollutants near the surface. Outdoor activities are generally best enjoyed during the dry season, avoiding periods of strong wind that may carry dust. Sensitive groups, such as individuals with respiratory conditions, should be mindful of potential dust events and fog-related air quality issues. During the wet season, air quality tends to improve overall, but short-term episodes of elevated humidity and reduced ventilation can impact those with sensitivities. The transition months (May and October) often present variable conditions, requiring vigilance and awareness of local weather patterns.