In Hidalgo State, an area of Mexico just north of Mexico City, many locals are suffering from a range of diseases caused by pollution alone. This area of Mexico is one of the most polluted on earth. Locals suffer from conjunctivitis and many different birth defects that affect a quarter of children.
Because pollution is such an issue, problems begin well before birth. A lot of this pollution is caused by the lack of a proper sewage system, which is dumped into their water reservoir. Because the residents consume this water, they take in the toxins and suffer as a result. Not only are locals seeing birth defects, but serious allergies, too (TRT World).