WB: Kali Puja, Diwali bring AQI down to 'poor'
When the Supreme Court allowed green fireworks during the festivals, it also issued an important rider. If the ambient air quality dipped from moderate to poor, even green crackers would be banned. In the five years prior to the pandemic, the air quality index (AQI) has turned from moderate to severe on Kali Puja-Diwali night and then remained poor for months due to the onset of winter.
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When the Supreme Court allowed green fireworks during the festivals, it also issued an important rider. If the ambient air quality dipped from moderate to poor, even green crackers would be banned. In the five years prior to the pandemic, the air quality index (AQI) has turned from moderate to severe on Kali Puja-Diwali night and then remained poor for months due to the onset of winter. 
