The situation was relatively better than previous years due to favourable meteorological conditions which diluted the effect of firecrackers and stubble burning
An AQI between zero and 50 is considered good , 51 and 100 satisfactory , 101 and 200 moderate , 201 and 300 poor , 301 and 400 very poor , and 401 and 500 severe .
If firecrackers are burst like last year, the air quality may plunge to severe levels on the night of Diwali itself and continue to remain in the red zone for another day