Kolkata: 2020 festival AQI was better than 2019’s
Awareness makes a lot of difference when it comes to keep the environment clean. In 2019, the concentration of particulate matter pollution — PM10 and PM2.5 — in Kolkata rose by 112% and 137%, respectively, on Kali Puja-Diwali nights compared to pre-festive nights. But in 2020, the pandemic taught us lessons the hard way. People valued clean air more than revelry and PM10 and PM2.5 rose by only 22.6% and 53.6%, respectively. The Central Pollution Control Board (CPCB) analysis showed that not only Kolkata, most other cities showed restraint to make it a clean Diwali.
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Awareness makes a lot of difference when it comes to keep the environment clean. In 2019, the concentration of particulate matter pollution — PM10 and PM2.5 — in Kolkata rose by 112% and 137%, respectively, on Kali Puja-Diwali nights compared to pre-festive nights. But in 2020, the pandemic taught us lessons the hard way. People valued clean air more than revelry and PM10 and PM2.5 rose by only 22.6% and 53.6%, respectively. The Central Pollution Control Board (CPCB) analysis showed that not only Kolkata, most other cities showed restraint to make it a clean Diwali. 
