Singapore's air pollution reaches its highest level this year The Straits Times reported that Singapore recorded a new and dangerous air pollution record following widespread fires in Indonesia. The concentration of harmful PM2.5 particles in western Singapore has risen to a record of 288 micrograms per cubic meter. For context, the standard accepted range for these particles is always between 0 and 55. Forest fires in Indonesia have been identified as the main cause of this environmental crisis and the highest annual level of pollution on record.