Toyota Motor Corp. and China's prestigious Tsinghua University are conducting joint research on air pollution, officials involved in the project revealed Saturday.

The research focusing on PM2.5, dangerous particulates with a diameter of less than 2.5 microns that are causing serious air pollution and health problems in China, is a rare instance of cooperation between the two countries at a time when the bitter sovereignty dispute over the Japan-held Senkaku Islands is intensifying.

Toyota and Beijing-based Tsinghua, one of the most renowned Chinese universities in engineering and technology education, intend to complete the research by March 2015, the officials said, adding that some interim results may be released earlier.