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Delhi recorded its lowest pollution levels this year on Monday after rains washed away the pollutants and cleansed the air, but the air quality still remained in the "very poor" category, the authorities said.
As many as 31 areas in the national capital recorded a "very poor" air quality, while two areas registered a "poor" quality air, the CPCB said.
Ghaziabad, Faridabad, Gurgaon and Noida in the National Capital Region (NCR) also recorded a "very poor" air quality, it added.
Delhi's air quality had improved significantly on Sunday after rains washed away the pollutants and cleansed the air on Saturday, the authorities said.
The air quality in the national capital has been oscillating between the upper range of "very poor" and "severe" categories for the past two weeks.
The overall PM 2.5 level (fine particulate matter in the air with a diameter of less than 2.5 micrometers) was recorded at 160 in Delhi, while the PM10 (fine particulate matter in the air with a diameter of less than 10 micrometers) level was at 243, it added.
The Centre-run System of Air Quality and Weather Forecasting (SAFAR) said the overall air quality over Delhi was very poor.
However, it also noted that the respite was not expected to last for more than two days as the relative humidity was very high and temperatures were likely to drop further, which would force the boundary layer to come down and hold the pollutants near the surface.
It said the AQI will start increasing gradually from Tuesday.
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