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Mexico City Plans Car-Driving Ban To Fight Air Pollution (csmonitor.com)
An anonymous reader writes: Mexico City plans to implement a car-driving ban from April 5 to June 30 in an effort to fight high air pollution levels. Under the city's new program, all privately owned cars must remain off streets one day per week as well as one additional Saturday per month. The initiative comes after the city issued a four-day air quality alert on March 14, after the city experienced air pollution at double the national acceptance level. "The definitive 'no circulation' program will align with the new rule for vehicular verification that will be presented soon," tweeted federal Environment Secretary Rafael Pacchiano. "In addition to the car ban, the commission is also working on medium-term solutions like improving public transport."
FWIW, Quito sits at 2700m above sea level, and Mexico City at 2240 — Both cities are in valleys, and the suburbs rise quite higher than their "downtowns" (although Quito is a much smaller, steeper valley). As a comparison, Beijing is 43m above sea level. A completely different picture.
In Mexico City, foreigners that come to visit do feel (lightly) the lack of oxygen, even in our best days pollution-wise. It is clearly not as impressive as what I have experienced, say, in El Alto, Bolivia, at 4070m.
The problem with smog is not lower oxygen, but higher irritation due to the other components in our air. In very bad, very polluted days, eyes sting due to ozone and PM10 particles, and it's easy to develop coughing also due to PM10 and airborne sulphur compounds. Carbon monoxyde does not decrease oxygen, but it decreases our body's capability of fully using it.