Time to correct flawed air pollution index

Environmental protection officials in Beijing have had an easy time since the Olympics last summer.

The city recorded fewer polluted days following its smog-cleaning campaign for the Olympics, and authorities last month announced that the city's air quality has reached the highest level in decades after meeting its annual target for "blue sky" days one month ahead of schedule, for two consecutive years.

But the fact that Beijing's air is now clean is bad news for reporters.