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San Luis, nestled in the Pinar del Río province of Cuba, occupies a geographically significant position within the westernmost part of the island. Located at coordinates 22.2828° N, -83.7681° W, the city sits within a predominantly rural landscape characterized by rolling hills and the beginnings of the Cordillera de Guaniguanico mountain range. The terrain is gently undulating, transitioning from fertile plains to more elevated areas as one moves south. San Luis benefits from proximity to the Gulf of Mexico, influencing its climate with humid air masses, but is not directly on the coast, mitigating some coastal storm surge risks. The surrounding region is heavily agricultural, primarily dedicated to tobacco cultivation – the heartland of Cuban cigar production – alongside fruit orchards and smaller-scale farming. This agricultural activity, while economically vital, contributes to potential air quality concerns through the use of pesticides and biomass burning for land clearing. The urban-rural gradient is quite sharp; San Luis itself is a relatively small city, quickly giving way to expansive agricultural lands. Industrial activity is limited within the city itself, but regional processing of agricultural products does occur, potentially impacting localized air quality. The city’s elevation, though modest, influences air circulation patterns and pollutant dispersion.

San Luis experiences a tropical climate with distinct wet and dry seasons, heavily influencing its air quality. The dry season, typically spanning November to April, sees lower rainfall and increased wind speeds, which can initially disperse pollutants. However, this period also coincides with increased agricultural burning to prepare fields for planting, leading to spikes in particulate matter (PM2.5 and PM10) and volatile organic compounds (VOCs). February and March are often the months with the highest concentrations of these pollutants. The wet season, from May to October, brings frequent rainfall and higher humidity. While rainfall effectively washes pollutants from the air, the increased humidity can foster mold growth, impacting respiratory health. August and September, peak hurricane months, can bring periods of stagnant air and trapped pollutants if storms stall nearby. Temperature inversions, though less common than in temperate climates, can occur during calmer periods, trapping pollutants near ground level. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during peak agricultural burning in the dry season and monitor conditions during periods of high humidity. Avoiding outdoor exertion during and immediately after rainfall is also advisable.