Mexico City is taking drastic measures to tackle its first environmental emergency in 14 years.
Private cars must now remain off the roads for one day a week, and one Saturday each month, in the Mexican capital.
"How can I agree with the policy when so many people are going to be left without a way of getting around?" one man told Al Jazeera.
And environmental groups such as Greenpeace say that such a programme is not a long-term solution to the peak levels of pollution not seen in the city since the 1980s.
These critics say that this car-limiting programme does not address other factors contributing to the pollution, such as factories.
Al Jazeera's Natasha Ghoneim reports.
