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Salinas de Hidalgo, nestled within the state of San Luis Potosí, Mexico, occupies a geographically significant position within the Huasteca Potosina region. Located at approximately 22.6280° latitude and -101.7156° longitude, the town sits at an elevation of around 1,350 meters (4,430 feet) above sea level, contributing to a generally cooler climate compared to lower-lying areas of Mexico. The surrounding landscape is characterized by rolling hills, lush valleys, and dense subtropical forests, typical of the Huasteca region’s unique microclimates. This terrain influences local wind patterns, often creating sheltered pockets and channeling effects that can impact air circulation. Salinas de Hidalgo is situated near the El Infiernito River, providing a vital water source and contributing to the region’s high humidity. The town’s urban character is primarily rural, with agriculture – particularly corn and livestock farming – dominating the local economy and landscape. The urban–rural gradient is gradual, with small agricultural plots and scattered rural settlements extending outwards from the town center. While not directly adjacent to major industrial belts, Salinas de Hidalgo benefits from its proximity to larger regional centers like Ciudad Valles, which can indirectly influence air quality through transportation emissions and occasional industrial activity. The Huasteca Potosina’s geological formations, including limestone bedrock, can also affect the dispersion of pollutants, sometimes leading to localized air quality challenges.

Salinas de Hidalgo experiences a distinct wet and dry season pattern, significantly impacting its air quality profile. The dry season, typically spanning from November to April, often sees a build-up of particulate matter. Reduced rainfall and lower humidity contribute to dust suspension from agricultural activities and unpaved roads, exacerbated by occasional wind gusts. Temperature inversions, common during the cooler months, trap pollutants near the ground, intensifying localized air quality concerns. The months of January and February often present the most challenging conditions for sensitive individuals. Conversely, the wet season, from May to October, brings frequent rainfall and higher humidity, naturally cleansing the atmosphere and dispersing pollutants. Monsoon-like conditions, with intense but localized showers, help to wash away particulate matter. Fog, particularly in the mornings during the transition periods between seasons, can temporarily reduce visibility and trap pollutants, though the effect is usually short-lived. During the wet season, outdoor activities are generally more favorable, especially for those with respiratory sensitivities. However, agricultural burning, a traditional practice, can occasionally occur during the transition to the dry season, leading to short-term spikes in smoke and particulate pollution. Individuals with asthma or other respiratory conditions should monitor local conditions and limit outdoor exposure during periods of agricultural burning or persistent fog. Children and the elderly are particularly vulnerable and should take extra precautions.