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La Vega, nestled in the Cibao Sur region of the Dominican Republic, occupies a geographically significant position within a fertile valley carved by the Río La Vega. Located at approximately 19.22° N, 70.53° W and an elevation of around 280 meters (919 feet) above sea level, the city benefits from a relatively mild climate influenced by its inland location and proximity to the Cordillera Central mountain range. The surrounding landscape is predominantly agricultural, characterized by expansive fields of sugarcane, fruits (particularly mangoes and avocados), and vegetables – a defining feature of the Cibao region’s economy. This agricultural intensity contributes to localized air quality concerns, particularly during harvest seasons. The urban fabric of La Vega is a blend of traditional colonial architecture and modern development, exhibiting a gradual urban–rural gradient as one moves outwards from the city center. The Río La Vega itself plays a crucial role in the region’s water resources and agricultural irrigation, though its water quality can be impacted by agricultural runoff. While not directly coastal, the Cibao region experiences trade winds that can influence air mass movement and dispersion. The city’s location within a valley can, at times, trap pollutants, especially during periods of stagnant air. Industrial activity is relatively limited compared to larger Dominican cities like Santo Domingo or Santiago, but small-scale manufacturing and processing plants, often related to agriculture, are present, contributing to localized emissions. The terrain is gently undulating, facilitating urban sprawl and agricultural expansion, further impacting the overall air quality profile.

La Vega’s tropical climate dictates a wet and dry season pattern, significantly influencing its air quality dynamics. The dry season, typically spanning December to April, often sees a slight improvement in air quality due to increased wind speeds and more frequent dispersion of pollutants. However, this period can also experience periods of stagnant air, particularly during anticyclonic conditions, leading to localized pollution build-up. Agricultural burning, a common practice for land clearing and sugarcane field preparation, is most prevalent during the transition months (February-March), contributing to elevated particulate matter concentrations. The wet season, from May to November, brings frequent rainfall, which naturally helps to cleanse the atmosphere by removing airborne particles. However, heavy rainfall can also lead to increased humidity, which can exacerbate respiratory issues for sensitive individuals. Fog, though not as frequent as in cooler climates, can occasionally form in the valley during the cooler months (December-January), trapping pollutants near the ground. Temperature inversions, where cooler air is trapped beneath warmer air, are less common but can occur, particularly during the dry season, hindering vertical mixing and concentrating pollutants. During the harvest season (typically November-January), increased agricultural activity and associated emissions contribute to a noticeable decline in air quality. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during these periods, limiting outdoor exertion and monitoring for any adverse health effects. The transition months, with agricultural burning, require particular vigilance.