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Lucban, Quezon, Philippines, nestles within a dynamic landscape shaped by the Sierra Madre mountain range and the Pacific Ocean, creating a unique interplay of topography and coastal influence. Situated at approximately 14.1133° N, 121.5569° E, the city’s elevation ranges from around 80 to 200 meters above sea level, contributing to localized microclimates. The surrounding terrain is characterized by rolling hills and agricultural plains, primarily dedicated to rice cultivation and the production of fruits like lanzones and rambutan. This agricultural activity, while vital to the local economy, can contribute to particulate matter in the air, particularly during harvest seasons when burning of agricultural waste is sometimes practiced. Lucban’s proximity to the Tayababas River provides a crucial water source and influences local humidity levels. The urban fabric is relatively compact, exhibiting a gradual urban-rural gradient as one moves away from the town center. While not directly adjacent to major industrial belts, Lucban’s location within Quezon province places it within reach of industrial zones in nearby cities like Calamba and Los Baños, potentially impacting air quality through transported pollutants. The prevailing winds, generally easterly, play a significant role in dispersing or concentrating pollutants, with the mountains acting as a barrier in some directions. The city’s geography, therefore, presents a complex scenario where natural factors and human activities converge to shape its air quality profile.

Lucban’s tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality. The dry season, typically spanning from November to May, often sees a slight improvement in air quality due to reduced rainfall and lower humidity. However, this period can also experience periods of stagnant air, particularly during temperature inversions, where cooler air becomes trapped beneath a layer of warmer air, preventing pollutants from dispersing. Agricultural burning, though ideally regulated, can be more prevalent during land preparation for the next planting season, contributing to particulate matter. The wet season, from June to October, brings frequent rainfall and higher humidity, generally leading to a cleansing effect on the atmosphere as pollutants are washed out. Monsoon winds during this period can also help disperse pollutants, although heavy rainfall can sometimes lead to increased levels of ozone due to photochemical reactions. Fog, particularly in the early mornings during the cooler months, can trap pollutants near the ground, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of agricultural burning and when fog is present. Outdoor activities are generally more favorable during the wet season, especially after rainfall, but vigilance is still advised, particularly near agricultural areas. The interplay of these meteorological factors creates a dynamic air quality landscape throughout the year in Lucban.