NEW DELHI: Firecrackers accounted for nearly 80 per cent of Delhi’s PM2.5 pollution during the early hours of November 9, according to source apportionment data. However, the Chamber of Trade and Industry (CTI) on Tuesday disputed the emphasis on firecrackers, arguing that other major pollution sources, including stubble burning, must also be addressed.The portal’s real-time analysis attributed 80.2 per cent of PM2.