By Katrina Hamlin
The author is a Reuters Breakingviews columnist. The opinions expressed are her own.
Skies above China’s big cities are turning blue, as its economic warning lights flash red. Across the country, PM2.5 readings – a measure of small particulates in the air – fell by 6 percent year on year in the first six months, Greenpeace reported in July. Beijing even scored the city’s least smoggy month since January 2011 according to data from the U.S. Department of State. Dirty industrials are leaving town and shutting down – but that’s just a quick fix.