CPCB Admits Excluding Extreme Pollution Readings, Reviewing Flawed AQI Calculation - The Central Pollution Control Board (CPCB) has admitted that particulate matter readings exceeding 999 micrograms per cubic metre (µg/m³) ... Get Latest News on National only on lokmattimes.com. This critical flaw stems from an outdated monitoring system designed in 2015, which could only measure concentrations up to 1,000 µg/m³.