Air quality by inhalable particulate matter (PM10) in five urban centers in South America

The present study aims to analyze the records of the inhalable particulate matter PM10 from 2002 to 2018 in the cities of Rio de Janeiro, Sao Paulo, Porto Alegre (Brazil), Montevideo (Uruguay), and Buenos Aires (Argentina), verifying if they were within the established limits and if the air quality reports, produced in each city, were contextualizing air pollution with relevant legislation and geographic factors. For this, we downloaded the air quality reports from websites of environmental agencies that, in accordance with their laws, are obligated to publish them. After reading, it was pointed out: the publication formats, if geographic factors were addressed in air quality analyses, the legal bases for the diagnosis, as well as which of them were more tolerant with air pollution, and the frequency they published their data and their justifications. Next, a comparison of the annual average and maximum in 24 hours PM10 records was performed. Therefore, we found that Sao Paulo presented the most complete document and Buenos Aires the least comprehensive. Rio de Janeiro exceeded PM10 tolerance limits several times, and Montevideo has the least polluted air quality. Only Buenos Aires did not address geographic factors as a form of analysis or suggestions. Finally, it is suggested that Porto Alegre and Buenos Aires should increase their data collection networks. The poor performance of some cities make it difficult to accomplish the task to transform them in more sustainable and healthy places.