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Castelar, situated in the Greater Buenos Aires metropolitan area of Argentina, occupies a relatively flat portion of the Pampas region. This vast, fertile grassland dominates the landscape, contributing significantly to the region’s agricultural output. The city’s coordinates (-34.6667, -58.6667) place it approximately 30 kilometers west of Buenos Aires city centre. The terrain is gently undulating, with a slight slope towards the Río de la Plata estuary, though Castelar itself is inland. This distance from the estuary mitigates some coastal influences but doesn’t eliminate humidity. The urban-rural gradient is pronounced; Castelar is transitioning from a predominantly residential suburb to areas retaining agricultural land, particularly to the west and south. This proximity to agricultural zones introduces potential for particulate matter from farming activities, including soil erosion and burning of agricultural waste. Industrial activity is concentrated closer to Buenos Aires city, but prevailing easterly winds can transport pollutants westward, impacting Castelar’s air quality. The dense urban sprawl of Greater Buenos Aires creates a heat island effect, influencing local wind patterns and exacerbating pollution episodes. The lack of significant topographical features limits natural ventilation, trapping pollutants during stable atmospheric conditions. This combination of factors makes Castelar susceptible to both locally generated and transported pollution.

Castelar experiences a temperate climate with distinct seasons, profoundly influencing air quality. Spring (September-November) brings increasing temperatures and wind, initially dispersing winter pollutants, but also pollen from the surrounding agricultural lands, impacting respiratory health. Summer (December-February) is hot and humid, with occasional heatwaves. Stable atmospheric conditions can trap pollutants, particularly ozone formed through photochemical reactions in the intense sunlight. August winds, though sometimes strong, can also stir up dust from agricultural fields. Autumn (March-May) offers generally cleaner air as temperatures moderate and rainfall increases, washing away accumulated pollutants. However, the practice of burning agricultural residue after harvest can lead to localised spikes in particulate matter. Winter (June-August) is the most challenging period. Temperature inversions are frequent, trapping cold air beneath a layer of warmer air, preventing vertical mixing and concentrating pollutants from vehicle emissions and residential heating (often wood-burning). Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these periods. Months to avoid prolonged outdoor exertion are July and August. March and April generally offer the most favourable air quality conditions. Monitoring wind direction is crucial, as easterly winds bring pollutants from the city.