Puerto Rico is the only place in the Americas meeting World Health Organization (WHO) pollution guidelines for air standards, according to available data on fine particulate matter, a report by the Swiss company IQAir found.
The report, published examined data collected by more than 30,000 ground-level air quality monitoring stations across 7,812 cities in 134 countries, regions, and territories. It showed that South America, along with Africa and the Middle East, had large portions of non-available measurements.
