India, Dec. 21 -- Amid a worsening air pollution crisis in parts of northern India, a Mumbai-based man has shared a simple experiment to demonstrate the effectiveness of N95 masks in filtering polluted air.

In a video shared on Instagram, user Aneesh Bhasin used a portable air quality monitor at Juhu Beach to record real-time air quality. The device initially showed an Air Quality Index (AQI) reading between 191 and 192, placing the air in the 'poor' category.

Bhasin then covered the air inlet at the back of the monitor with an N95 mask. Within seconds, the AQI reading dropped sharply and stabilised at 37 - a level considered 'good'. When the mask was removed, the AQI spiked again, rising to around 201.

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