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Sandino, nestled within the Pinar del Río Province of Cuba, occupies a geographically significant position within the island’s westernmost region. Located at approximately 22.0815° N, 84.2040° W, the city sits amidst a landscape dominated by rolling hills and fertile plains, characteristic of the Viñales Valley’s periphery. This region is renowned for its *mogotes*, dramatic limestone karsts that punctuate the landscape, influencing local wind patterns and drainage. Sandino’s elevation, while relatively modest, contributes to localized microclimates. The city’s proximity to the Gulf of Batabanos, a shallow gulf of the Caribbean Sea, introduces maritime influences, including humidity and occasional sea breezes. The surrounding terrain is primarily agricultural, with tobacco farming being the dominant land use – Pinar del Río is globally recognized for its premium tobacco production. This agricultural activity, while economically vital, can contribute to localized air pollution through the use of fertilizers and pesticides, and the burning of agricultural waste. The urban–rural gradient around Sandino is gradual, with small villages and farms seamlessly blending into the urban fabric. Further east, the landscape transitions towards more rugged terrain. The city’s location, sheltered somewhat by the surrounding hills, can lead to stagnant air conditions, particularly during periods of calm weather, potentially trapping pollutants. Industrial activity is limited within Sandino itself, but the broader Pinar del Río province has some processing facilities related to tobacco and sugar, which could impact regional air quality.

Sandino’s tropical climate dictates a distinct wet and dry season pattern, significantly influencing air quality dynamics. The dry season, typically spanning from November to April, often sees clearer skies and reduced humidity, but can also bring about periods of stagnant air. Calm conditions are more frequent during these months, leading to a potential build-up of pollutants from agricultural activities and domestic sources. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are possible, further exacerbating this issue. The wet season, from May to October, brings frequent rainfall and increased humidity. While the rain naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can trap certain gaseous pollutants. The intensity of rainfall and the frequency of storms vary considerably, impacting the overall cleansing effect. During the peak of the wet season (August-September), hurricane season, strong winds can disperse pollutants, but also introduce dust and debris into the air. The months of March and April often experience a transition period with increased dust from nearby agricultural lands, potentially impacting respiratory health. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should be particularly cautious during periods of calm weather in the dry season and during heavy rainfall events in the wet season. Outdoor activities are generally more favorable during the wetter months, but vigilance regarding potential storm impacts is crucial.