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Delhi's air quality dropped to the 'very poor' category on Sunday while the Air Quality Index (AQI) stood at 309, informed the System of Air Quality and Weather Forecasting And Research (SAFAR) - India.
Meanwhile, the air quality in Noida is also in the 'very poor' category with an AQI of 372 while the air quality in Gurugram is in the 'poor' category with an AQI of 221.
