NANNING, China, April 12 -- The Environmental Protection Bureau of Nanning released a plan to guarantee a safe environment, as the 45th World Gymnastics Championships will be held here in October.

It was written in the plan that the air quality should be at least "good," with the air quality index (AQI) no more than 100; the quality of drinking water shall reach the standard, and no significant environmental accident breaks out during the World Gymnastics Championships.

The plan put forward measures to prevent environmental accidents from the aspect of atmosphere, water, noise and hazardous wastes.

In 2013, there were over 90 days when the AQI of Nanning did not reach the standard. In order to meet the objectives, 223 industrial enterprises have to suspend production, and 1,004 chimneys that emit waste gas will be renovated during the championships.