The Central Pollution Control Board or CPCB has asked for all construction activity to be stopped in the national capital region or NCR as Delhi and its neighbouring townships of Noida, Gurgaon, Ghaziabad and Faridabad are known.
The authority also ordered stone crushing to be stopped with immediate effect in all areas as well.
The fire brigade has been asked to sprinkle water across Delhi to bring down the dust and particulate matter suspended in the air.
It has also asked municipal corporation to bring in road sweeping machines to keep the dust off the streets.
The air quality in Delhi deteriorated because of dust storms in western India, particularly Rajasthan, which increased coarser particles in the air, the CPCB said.
According to the CPCB, the air quality index - a measurement of the concentration of toxic particulate matter in the air - at several places in Delhi remained beyond the 500-mark, with east Delhi's Anand Vihar area recording a PM10 level of 929 and PM2.5 level of 301 this morning.
An AQI between 0-50 is considered "Good", 51-100 "Satisfactory", 101-200 "Moderate", 201-300 "Poor", 301-400 "Very Poor", and 401-500 "Severe".
The wind blowing in the region has contributed to the spread of dust particles. According to the Met department, wind speed reaching up to 35 kmph is predicted for today in Delhi. The dust-laden winds have created a haze in Delhi-NCR since yesterday.
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