Humidity during the morning hours was recorded at 60%, the official added.
Power supply was affected in many areas in Delhi and Gurugram in Haryana.
The Met office has forecast light rains will follow the dust storm.
The Indian Meteorological Department (IMD) had yesterday warned of thunderstorm and squall in parts of North India including Delhi.
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Metro services between Indraprastha and Karol Bagh metro stations were disrupted after a tree fell on the tracks. "This is likely to lead to consequential delays", said an airport official.
# 05:19 PM: Vistara's Srinagar flight to Delhi has been diverted to Amritsar following bad weather conditions in Delhi.
However, be it the upcoming Monsoon or high-velocity duststorms, it will give no relief to people in Vidarbha, parts of Rajasthan and Madhya Pradesh. At bus stops in south Delhi, people were seen huddling together to protect themselves as branches of overhead trees broke.
The IMD has also forecast rain in isolated parts of eastern Uttar Pradesh and said the weather is most likely to remain dry in western U.P.
A depression is seen in South India which might extend Central India to Rayalaseema and a cyclonic circulation is seen over Comorin and adjoining Tamil Nadu.
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# 05:04 PM: Haryana: Skies in Faridabad turn dark as strong winds and dust storm hit the region.
A total of 31 domestic flights and six worldwide flights were delayed after the storm hit Delhi early evening.
Thunderstorm over the hill states is due to a new western disturbance that is likely to start from Sunday.
Thunderstorm accompanied with squall with wind speed reaching 50-70 kilometres per hour are "very likely" at isolated places over east Uttar Pradesh, Assam, Meghalaya, Nagaland, Manipur, Mizoram, Tripura, Gangetic West Bengal, Odisha and Jharkhand, it said.
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