Air pollution is a serious problem for the world population, because in the last six years its levels have remained high. This situation has led to nine out of ten people breathing air with high levels of pollutants, causing the death of seven million people a year, according to the World Health Organization (WHO).
These deaths are due to both outdoor pollution and harmful air inside homes, caused mainly by food preparation methods, inefficient energy, sand and dust from the desert, burning waste and deforestation that can be aggravated by geographical, meteorological and seasonal factors.
According to the Health Agency of the United Nations (UN), the pollution of fine particles causes life-threatening diseases such as strokes, heart attacks, pulmonary obstructions and respiratory infections, greatly affecting children, people who do their jobs outdoors and women.
The “reasonable” level of contaminating particles is an annual average of up to 10 micrograms per cubic meter. If the presence is greater, it can be considered that there is contamination harmful to health and if it is less, that the air is clean. The particles in suspension are the main ingredients of the mists, fumes and dust in suspension, which generate serious problems in the quality of the air. These particles have a wide range of sizes and are classified according to their aerodynamic diameter in PM10 (particles with an aerodynamic diameter less than 10 microns) or PM2.5 (aerodynamic diameter less than 2.5 microns). The latter are more dangerous, since when inhaled they can reach the peripheral areas of the bronchioles and alter the pulmonary exchange of gases.
In Latin America you can find both types of air. Among the Latin American cities with the cleanest air are: Salvador de Bahía: is a Brazilian city and municipality, which according to the World Health Organization has the cleanest air in Latin America. This is because the annual average indicated that in the air only 9 micrograms of PM 2.5 per cubic meter and 17 micrograms of PM10 were suspended (particles less harmful than PM 2.5).Ibarra: the Ecuadorian city better known as “the white city” (La ciudad blanca, in Spanish) is the second city in Latin America with the least contaminated air, according to WHO, since 9 micrograms of PM 2.5 and 18 micrograms were found suspended in the air of PM 10.Cali: is a city in Colombia that according to the measurements of the DAGMA (Administrative Department of Environmental Management, in English) is below what is allowed by the norm in the country (50 micrograms per cubic meter of particulate material circulating in the air), since 19 micrograms per cubic meter were found suspended in the air.