China's industrial output strengthened in the first two months of the year, official data showed Wednesday, led by production at state enterprises.

Output at factories and workshops expanded 7.2 percent year-on-year in January and February combined, the National Bureau of Statistics (NBS) said, beating the 6.2 percent recorded in December and the 6.2 percent forecast in a Bloomberg News survey of analysts.

The higher output comes even as authorities press on with their fight against smog by clamping down on polluting heavy industries.

The drastic measures are working, with a recent analysis by the University of Chicago showing that cities have cut levels of PM 2.5 -- the tiny airborne particles considered most harmful to health -- by an average of 32 percent over the past four years.

"The national economy has maintained stable and sound development in the first two months of 2018," said NBS spokesman Mao Shengyong.

It "is a good start for high-quality development" Mao said, using President Xi Jinping's new buzzword for the "new era" economy China is aiming for.

The retail sector -- which China is counting on to propel its high-quality development -- recorded solid growth, a sign that China's rebalancing from its export and investment led economic model to one driven by consumer spending is well underway.