In theory, this should force people to either carpool or suck it up and use public transportation. But in practice, it just made them buy more cars to get around the rule. According to a study by an Indian university, air pollution went down in Delhi the first time the rule was tried, but on the second attempt it increased by 23%. Not coincidentally, the number of cars on the roads went up too. There's no way the authorities could have known the scheme would have this effect ... unless they'd looked at Mexico City, where precisely this had already happened.
In Mexico, CO2 levels dropped by 11% at first, but they eventually went up by 13% as people rushed to buy more cars. And like in India, these second vehicles were mostly used ones, because they're cheaper and you know what number you're getting on the plate. But they also tend to be older, shittier, and pollute more. Despite this, India intends to continue using the odd-even scheme periodically. So we hope everybody enjoyed the free trial period for "breathing." It has now expired.