At least 10 people died on Friday when a truck loaded with fireworks exploded and caused part of a highway bridge to collapse in Henan province.

"Safety is the biggest concern for us," said Xiao Hong, owner of a certified fireworks store in Beijing.

"Besides me, all my three assistants have finished a day's training organized by Beijing Administration of Work Safety and passed the test before opening the store," she said.

Xiao said she sold about 2,000 yuan ($321) worth of fireworks and firecrackers on Tuesday morning.

"Although sales were not bad, I am worried this year the total sales may go down because of air pollution reports and safety problems."

Li Zhiqiang, another shop owner in Beijing, said security inspections were more strict this year.

"About eight groups of inspection teams, including police officers, work safety officials and firefighters, came to my shop in the morning, and inspected every corner," he said, adding that he installed a real-time communication system, which includes a camera and two speakers, to link the store to Beijing Administration of Work Safety.

"In this way, the work safety department can monitor the store, and we can report to the department immediately if any danger occurs," Li said.