Erick Velasco, Ph.D. in environmental engineering, says that the norm NOM-044 exemplifies the slow implementation of policies that affect the interests of certain powerful groups.
It was reported in Azcapotzalco, Gustavo A. Madero, Cuauhtémoc and Miguel Hidalgo.
The app came under fire by users and city officials on Wednesday when the city ordered 40 percent of the city's cars off the road to reduce smog.
The British band confirmed the concert in Mexico City's Foro Sol on November 16.
Factories across greater Mexico City were ordered to cut emissions by 30 to 40 percent, and gas stations without vapor recovery systems were told to close.
Many vehicles will be unable to travel in Mexico City on Tuesday.
The situation affects 15 municipalities in the State of Mexico and eight metropolitan districts.
Acting on a tip, the FBI and Mexican authorities found Llorens and Allen, then 17, near Mexico City on Sept. 30, 2014.
Until now vehicles have been exempt from Mexico City's "no circulation" rules if owners obtain a holographic sticker from a smog-check center certifying them as lower-emission.
Half of them come from neighboring states, especially from Ecatepec, Chalco, Nezahualcóyotl and Chimalhuacán in the State of Mexico, and the rest live in Cuauhtémoc, Gustavo A. Madero, Iztapalapa and Iztacalco districts in Mexico City.