Dec 24 most polluted day of the month in Delhi so far
Delhi witnessed the most polluted day of the month so far on December 24, as per reports. The level of particulate matter with diameter less than 2.5 micrometer (PM 2.5) touched the 500-mark, which is the highest recordable value in the national capital. The minimum safe level of PM 2.5 set by Central Pollution Control Board is 60 µg/m3.