About 75 percent of the air pollution is caused by toxic gases such as carbon monoxide, sulfur dioxide which is emitted by the vehicles. ... As Mexico is also located at a high altitude, the sunlight is stronger than that on the sea level, causing pollutants to react with each other producing a toxic gas called ozone.
However, after loosening regulations in 2015 by the Mexico City government, air pollution has steadily increased in recent years in Greater Mexico City. This regulatory change was fostered by political reasons and backed by several parties. In April and May 2016 ozone and suspended matter pollution in Mexico City had reached levels that were detrimental to health, though the criterion to signal a pollution alert is lower in 2016 than it was in the 1980s.[6] The city's population continues to grow, to spread out, which lengthens automobile trips, and the number of autos in the city increases yearly.
Connections have been found between air pollution and school absenteeism among children in Mexico City between air pollution and heart rate variability among the elderly in Mexico City, and between urban air pollutants on emergency visits for childhood asthma in Mexico City
https://web.stanford.edu/class/e297c/trade_environment/energy/hmexico.html
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