BEIJING, June 29 -- President Xi Jinping has called for further efforts to eliminate corruption, describing it as "the deadliest pollution source" for the political environment within the Communist Party of China (CPC).

Xi, also general secretary of the CPC Central Committee, made the remarks on Tuesday afternoon at a group study on Party discipline attended by members of the Political Bureau of the CPC Central Committee.

Xi stressed that a serious, healthy and clean political environment within the CPC is crucial to the Party maintaining its vigor, advantages, creativity and unity over the past 95 years and is what distinguishes the CPC from non-Marxist parties.

The CPC is set to celebrate its 95th anniversary on July 1.

Recalling the CPC developing from only 50-plus members to the world's largest ruling Party with more than 88 million members, Xi noted that such growth is based in the ties with the people, rationality, firm beliefs, sound organization and rules, and all which are closely related to the political environment within the Party.

"We should pay equal attention to preventing bad acts and encouraging good ones to fill our Party with positive energy and leave no room for evil," Xi said.