A four-month national campaign to improve the quality of agriculture products has yielded encouraging results, but challenges remain, a senior official said yesterday.

Speaking at a press conference organized by the State Council Information Office, Agriculture Vice-Minister Gao Hongbin said: "We have successfully completed our mission to improve quality and safety."

The government launched a campaign in August to crack down on substandard consumer products and improve food safety in the wake of a number of complaints from the domestic and foreign markets.