Suspended particulates, called PM2.5, represent the worst pollution in terms of health, according to the European Environment Agency. The World Health Organization (WHO) states that the particulates start to be harmful when the average annual concentration in the air exceeds 10 micrograms per cubic meter.
Latin America's population has been severely exposed to poor air quality for decades, though the situation has improved over the past five years. Puerto Rico and Uruguay have the cleanest air and the lowest levels of PM2.5
In the table on the left, 10 indicates the maximum level recommended by the WHO. Anything above that is unhealthy for human beings.
Source: World Bank's Environmental Database 2019
ENVIRONMENT THE AIR WE BREATHE People exposed to exceeding levels of pollution (% of total) Country 2012 2017 % ch. Argentina 99.22 93.85 -5.72 Bolivia 100.00 100.00 0.00 Brazil 86.83 68.14 -27.44 Chile 99.30 97.66 -1.68 Colombia 99.86 92.10 -8.42 Costa Rica 100.00 99.69 -0.31 Dominican Rep. 100.00 99.91 -0.09 Ecuador 100.00 98.32 -1.71 Guatemala 100.00...