The Interior Ministry has signed a memorandum of understanding with Siam Kubota Corporation and the Rang Jorakhe district administration office in Ayutthaya province under a “Straw Bales for Zero Burn” campaign aimed at reducing air pollution, especially PM2.5 dust particles, that are caused by farmers burning their leftover crops to prepare for the next cultivation season, Deputy Interior Minister Nipon Bunyamanee said on Tuesday.