The No Circulation Program ordered in Mexico City is effective in reducing pollution peaks, but is insufficient to address the long-term environmental problems of the metropolis.
Cases of babies born with microcephalia have been confirmed only in Brazil and French Polynesia.
The World Health Organization declared the Zika outbreak, suspected of causing thousands of birth defects in Brazil, an international health emergency on Feb. 1.
The head of the World Health Organization's Zika team is predicting a "fantastic Olympics".
Brazil said it has confirmed more than 500 cases.
Marie-Paule Kieny, WHO assistant director-general for health systems and innovation, says the U.N. health agency's response is "proceeding very quickly"
The county department said on Twitter that the person was infected through sexual contact with someone who had traveled to Venezuela.