Mexico City gets 2nd smog alert
{{#rendered}} {{/rendered}}
Mexico City authorities have declared a new pollution alert and will require 40 percent of cars to keep off the streets Tuesday.
Under a rule in effect through June, one-fifth of the city's cars normally must stay at home on a weekday, with the day determined by license plate numbers. But on Monday smog rose above 1½ times acceptable limits, meaning another fifth of cars are ordered off the streets.
The alert marks the second time in less than a month that the alert level has been reached despite the temporary program aimed at improving the capital's dirty air.
{{#rendered}} {{/rendered}}
Before the rule was implemented last month, newer or cleaner cars were exempt from the one-day driving ban.
Authorities have pledged to come up with now, tougher vehicle emissions tests.
.