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Oroquieta City, nestled in the province of Misamis Occidental, Philippines (8.4800° N, 123.8000° E), occupies a strategic position within the Panguil Bay region. The city’s terrain is characterized by a gentle slope descending towards the bay, creating a complex interplay between coastal breezes and inland air circulation. Situated approximately 17 kilometers inland from Panguil Bay, Oroquieta isn’t directly exposed to strong marine winds, but benefits from some moderation of temperatures. The surrounding landscape is predominantly agricultural, with extensive rice paddies and plantations of corn, coconut, and banana dominating the rural areas. This agricultural activity, while vital to the local economy, contributes to particulate matter through land preparation, harvesting, and potential burning of agricultural waste. The urban core of Oroquieta, with a population of 72,301, is experiencing growth, leading to increased vehicular traffic and construction – both significant sources of localized air pollution. The urban-rural gradient is relatively sharp, with a noticeable increase in air pollutant concentrations as one moves closer to the city center. The presence of the nearby Mount Malindang Range influences wind patterns, potentially trapping pollutants during periods of calm weather. The city’s location within a tropical climate also means high humidity and potential for temperature inversions, exacerbating pollution events.

Oroquieta City experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, typically from February to May, sees a peak in particulate matter pollution. Reduced rainfall means less atmospheric cleansing, and agricultural practices like land preparation and potential slash-and-burn farming contribute significantly to airborne dust and smoke. Stronger sunlight during these months also promotes the formation of ground-level ozone, particularly in areas with high vehicle traffic. Conversely, the wet season, spanning June to November, generally brings improved air quality. Frequent rainfall effectively washes pollutants from the atmosphere, and higher humidity can suppress dust. However, the monsoon winds can occasionally transport pollutants from other regions. December and January represent a transitional period, with fluctuating rainfall and moderate pollution levels. Sensitive groups – children, the elderly, and those with respiratory conditions – should exercise caution during the dry season, limiting strenuous outdoor activity, especially during peak sunlight hours. Monitoring wind direction during the monsoon season is also advisable. Fog, common in the early mornings, can trap pollutants near the ground, temporarily worsening conditions. Overall, the wet season offers the most favourable conditions for outdoor activities.