Most likely smog. Mexico City has a worse smog problem than Los Angeles ever had.
They train a couple of days each week
3 days..roughly 70 hrs.
For only 122 days, at the city of Cuernavaca, 59 Km (37 mi) south of Mexico City.
Cancun is such city. It is a fact that on average, it has more than 240 days of sunshine per year.
it would take about three days for a letter to travel to Mexico from new york if it was travailing three hundred miles an hour.
None. Mexico City is below the snow line; its average annual temperature is 16 ºC (60.8 ºF).The last snowfall recorded in Mexico City happened on January 11, 1967; it was a 5 cm (2 in) snowfall.
12 days and 7 hours according to google maps walking routes
Of course; not all days are sunny even in Mexico. On summer months it is usual to have thunderstorms and even hailstorms.
According to the latest figures, unemployment in Mexico City reached 6.07% of the working population during the early days of September, 2013.
40
Mexico City forms part and is capital of present-day Mexico. Its government is that of a federal district - such as Washington DC is to America - and its main difference from the days of the Aztec Empire is that when it was Tenochtitlan, it was a pre-industrial city, capital of the Aztec Empire.