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Cedral, nestled within the state of São Paulo, Brazil, occupies a geographically significant position within the broader Paraíba Valley region. Located at approximately -20.9028° latitude and -49.2678° longitude, the municipality’s terrain is characterized by gently rolling hills and valleys, typical of the Serra do Mar foothills. Its elevation, while modest, contributes to localized microclimates and influences air circulation patterns. Cedral’s proximity to the Rio Paraíba do Sul, a vital waterway, moderates temperatures and introduces humidity, but also presents potential for localized fog formation, which can trap pollutants. The surrounding landscape is a blend of agricultural land – primarily sugarcane and citrus cultivation – and patches of Atlantic Forest remnants, a biodiversity hotspot increasingly fragmented by human activity. This agricultural intensity contributes to diffuse pollution sources, including pesticide drift and emissions from agricultural machinery. Cedral’s urban footprint is relatively small, reflecting its population of just over 12,600, creating a gradual urban-rural gradient. However, its location within the São Paulo metropolitan area’s sphere of influence means it’s indirectly affected by industrial activity and transportation emissions originating from larger urban centers. The prevailing winds, generally flowing eastward from the interior towards the coast, play a crucial role in dispersing or concentrating pollutants, impacting Cedral’s air quality. The valley’s topography can also lead to stagnant air conditions, particularly during periods of high atmospheric pressure, exacerbating pollution episodes.

Cedral’s tropical climate dictates a distinct wet and dry season pattern, significantly influencing its air quality dynamics. The dry season, typically spanning from April to September, often witnesses a noticeable increase in particulate matter concentrations. This is partly attributable to increased agricultural burning practices, employed to clear land for planting and harvesting, releasing significant quantities of smoke and soot into the atmosphere. Reduced rainfall during this period also limits the natural cleansing effect of precipitation, allowing pollutants to persist longer. Temperature inversions, common during the cooler, drier months, trap pollutants near the ground, further degrading air quality. Conversely, the wet season (October to March) brings frequent rainfall and higher humidity, which naturally washes away particulate matter and dilutes gaseous pollutants. Stronger winds associated with convective storms also aid in dispersion. Fog, a frequent occurrence along the Rio Paraíba do Sul, can exacerbate air pollution during the dry season by trapping pollutants in a localized area. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Outdoor activities are generally more favorable during the wet season, although heavy rainfall can still impact visibility and air quality. Monitoring local weather forecasts and agricultural activity reports can provide valuable insights into potential air quality risks, allowing for proactive adjustments to daily routines.