Bihar Air Quality

Capital: Patna · Population: 130M · 18 monitoring stations

210

Poor

2024 Annual Avg

210

Annual AQI

Rank #3 in India

88 μg/m³

PM2.5

18× WHO limit

370

Winter Peak

Oct–Feb average

85

Summer Low

Jul–Sep average

Health Advisory — Poor

Poor air quality. Sensitive groups must avoid outdoor activity. Others should reduce prolonged exertion.

Major Cities in Bihar

Live AQI updated every 30 minutes from WAQI. 2024 Avg from CPCB annual data.

Air Quality in Bihar

Bihar sits in the eastern Indo-Gangetic Plain where stagnant winter air traps pollutants. Patna and Muzaffarpur consistently rank among India's worst. Widespread biomass and crop residue burning drive PM2.5.

Main Pollution Sources

biomass burningbrick kilnsvehiclescrop burning

Seasonal AQI Patterns in Bihar

❄️Winter (Oct–Feb)~370

Worst season. Temperature inversions, crop burning, and low wind speeds trap pollutants. AQI often exceeds 300 in northern states.

☀️Pre-Monsoon (Mar–Jun)~228

Dust storms and heat raise AQI. Less fog than winter. Industrial activity at peak.

🌧️Monsoon (Jul–Sep)~85

Best air quality of the year. Rain washes out PM2.5 and PM10. AQI typically falls to lowest levels.

🍂Post-Monsoon (Oct)~278

Rapidly deteriorating. Crop stubble burning begins in northern states. AQI transitions from good to dangerous.