Premier Li Keqiang said Wednesday China will set up a special fund and pool the country's best scientists to find out the "unique" cause of smog that frequently blankets north China in winter.

"The cause of smog should be found out as soon as possible so our response will be more effective," Li said while addressing a press conference after conclusion of the annual national legislative session.

The government is determined to spend as much as needed for the research, he said, pledging that the country will fight and win the battle against smog.

"Smog tackling methods will focus on coal-burning, automobile exhaust, and dust," he said, but acknowledging that the it takes time to win the battle.

"The weather is not something humans can control," Li said, "but we can choose our behaviors and transform the model of development."

"We all want blue sky," he continued. "Blue sky won't be a luxury, nor should it be."