Patna, Oct 21 (PTI) Air quality in Bihar's capital Patna and six other cities plunged into the "poor" category on Tuesday, a day after Diwali celebrations, officials said.

The seven Bihar cities are Patna, Hajipur, Saharsa, Samastipur, Araria, Purnea and Begusarai.

According to the Central Pollution Control Board (CPCB) daily 'Air Quality Index' (AQI) bulletin of October 21, Hajipur was the worst among cities in Bihar with an AQI of 291.

The six other Bihar cities where the AQI was in the poor category on Tuesday are Saharsa (273), Samastipur (236), Patna (226), Araria (222), Purnea (211) and Begusarai (203).

Poor air quality causes breathing discomfort to most people on prolonged exposure.

Commenting on poor air quality in seven cities in the state, Bihar State Pollution Control Boar

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