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Bagong Silangan, nestled within Quezon City in the Philippines, occupies a geographically complex position within the broader Metro Manila conurbation. Situated at approximately 14.7094°N, 121.1000°E, the area is characterised by undulating terrain, a consequence of its location within the eastern fringes of the city, transitioning towards the foothills of the Sierra Madre mountain range. This elevation, while offering some respite from the intense heat of the central plains, also contributes to localized air stagnation. The Pasig River, a major waterway, lies to the west, and while not immediately adjacent, its influence on regional humidity and wind patterns is significant. Bagong Silangan experiences a pronounced urban-rural gradient; while increasingly urbanized, pockets of agricultural land and green spaces remain, interspersed with residential subdivisions. Surrounding industrial zones in nearby cities contribute to baseline pollution levels. The dense population of 106,886 concentrates emissions from domestic sources – cooking, transport, and small-scale industries. The city’s position within a major metropolitan area means it’s heavily reliant on road transport, a primary source of particulate matter and nitrogen oxides. Topography funnels pollutants, exacerbating air quality challenges, particularly during calm weather conditions. The interplay of these factors creates a unique microclimate influencing pollutant dispersion.

Air quality in Bagong Silangan follows a pattern dictated by the Philippines’ tropical monsoon climate, rather than traditional four seasons. The dry season, typically from November to May, sees a peak in pollution. Reduced rainfall means less atmospheric cleansing, and increased dust from construction and unpaved roads contributes to higher particulate matter concentrations. February and March are often the most challenging months, with stable atmospheric conditions and increased vehicle use. The southwest monsoon, arriving around June, brings much-needed relief, washing pollutants from the air. However, increased humidity can also promote the formation of secondary pollutants. August and September, the peak of the monsoon, generally experience improved air quality, though localised flooding can disrupt traffic and increase emissions from idling vehicles. The *amihan* (northeast monsoon) from October to February brings cooler, drier air, but can also lead to temperature inversions, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season and periods of inversion. Monitoring wind direction is crucial; winds from industrial areas to the west will carry higher pollution levels. Staying indoors during peak hours and using air purifiers are recommended.