Mexico plans to halve fuel emmissions

In my wanderings on CNN.com, I came across this article and it was like a throw-back to the discussion we had about the CAFE standards for cars in the US, only just a little different.

In Mexico, apparently alot of their gasoline contains sulfur and small particles, and, in an endeavor to improve the air quality of Mexico City, in addition to the rest of the country, the government has signed off on an agreement that plans to reduce sulfur emissions by 50% before 2020.

With Mexico City being listed among the world's most polluted cities, it's no wonder that the government put this into effect. The residents lose 2.5 million working days every year to health problems caused by soot and other forms of particle matter. That's a lot of time and money that gets lost every year! And while the government may be shelling out more money to get its own oil company, Petroleos Mexicanos, to reduce the sulfur content of its diesel fuel and gasoline, they may be getting back more in taxes from the 2.5 million working days that will no longer be lost.

Do you think that this is going to be as beneficial in actuality as it appears on paper? Are there unforseen complications that are going to come up as a result of this?