In Q3 are the capital cities Skopje, Kathmandu, Paris and Belgrade, who register a population and stations lower than average. The capitals with a registry between 500,000 Pp/ES and 700,000 Pp/ES are Bogota, Tehran, Tokyo, Vilnues, Kyiv, Warsaw, Kubait City, and Santiago. Finally, from 700,000 Pp/ES to 1,000,000 Pp/ES, are Colombo, Ankara, Mexico City and Cyprus. These capitals cities are identified between Q1 and Q3. In Q4 the capitals with a low number of stations measuring PM2.5 can be seen, due to the number of inhabitants of each one. Above 3,000,000 Jakarta, Hanoi, Lima and Dhaka are identified. Lima has several weather stations, however, there is only one station that PM2.5 register data. The cities with the highest pollution, Delhi (India) and Beijing (China), present a ratio of 1,766,333 Pp/ES and 1,227,059 Pp/ES respectively. Although meteorological stations are installed based on population, it is observed that countries such as Singapore, Hanoi, Kakarta and Dhaka with populations over 5,000,000, have a number of below-average meteorological stations, which makes monitoring difficult and not It allows to have data of the real contamination.