Air quality in Delhi slightly improves, moves to 'poor' category

The air quality in the national capital has improved to the 'poor' quality on Sunday with the overall Air Quality Index (AQI) at 290. According to the System of Air Quality and Weather Forecasting And Research (SAFAR), the concentrations of PM 2.5 and PM 10 stood at 117 in the 'poor' and 193 in the 'moderate' category respectively.

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