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Santo Augusto, nestled in the rolling hills of northern Rio Grande do Sul, Brazil, occupies a unique geographic position. Located at -27.8508 latitude and -53.7769 longitude, the city sits approximately 480 meters above sea level, contributing to a temperate climate with distinct seasons. The surrounding landscape is predominantly agricultural, characterized by extensive soybean, corn, and wheat cultivation, alongside pastureland for cattle ranching. This agricultural dominance significantly influences local air quality, with potential for particulate matter from field preparation, harvesting, and the application of fertilizers and pesticides. The city is situated roughly 60km from the Uruguay River, which, while not immediately adjacent, exerts a moderating influence on regional temperatures and humidity. Santo Augusto isn’t part of a major industrial belt, but smaller agro-industries processing agricultural products are present. The urban-rural gradient is relatively sharp; the city centre gives way quickly to expansive farmland. Topography, with its undulating hills, can create localized pockets of stagnant air, exacerbating pollution during calm weather conditions. The prevailing winds generally flow from the south-southeast, potentially carrying pollutants from more developed areas further east. Understanding this interplay of agriculture, topography, and wind patterns is crucial for assessing and mitigating air quality concerns in Santo Augusto.

Santo Augusto experiences a humid subtropical climate, with air quality fluctuating significantly throughout the year. Spring (September-November) sees increasing agricultural activity, leading to a rise in particulate matter from field preparation and burning of crop residue, often worsened by moderate winds dispersing the pollutants. Summer (December-February) brings higher temperatures and humidity, potentially fostering the formation of ground-level ozone, particularly on sunny, stagnant days. Rainfall is also common, which can temporarily improve air quality by washing away pollutants. Autumn (March-May) is often considered the most pleasant period, with cooler temperatures and reduced agricultural activity, resulting in generally cleaner air. However, the risk of wildfires increases as vegetation dries, potentially causing smoky conditions. Winter (June-August) is characterized by cooler temperatures and frequent temperature inversions, trapping pollutants near the ground. This can lead to increased concentrations of particulate matter from residential wood burning for heating. Sensitive individuals, such as those with respiratory conditions, should be particularly cautious during winter and periods of high agricultural activity. Months to favour for outdoor activity are generally April and May, while avoiding prolonged exposure during late summer afternoons and winter mornings is advisable.