The Supreme Court-appointed Environment Pollution (Prevention and Control) Authority (EPCA) on Saturday ordered the Delhi government to extend the ban which was imposed on November 2.

The restrictions imposed till November 10 were extended to November 12, by when there will be an improvement in the air quality of Delhi-NCR, as forecast by pollution monitoring agencies.

The restrictions were imposed by the EPCA under the Graded Response Action Plan (GRAP).

Delhi's air quality started deteriorating a day after Diwali to "severe-plus" or "emergency" due to fireworks and weather conditions like wind speed and dipping mercury, leading to lower dispersion rate of pollutants. The Air Quality Index (AQI) on Saturday was 401 or "severe".

"The CPCB-headed task force has informed EPCA that given the prevailing adverse conditions, the following measures will remain until November 12, when it will further review the situation and inform us," said EPCA Chairman Bhure Lal, in a letter to Delhi Chief Secretary Anshu Prakash, the Delhi Environment Secretary and the Delhi Pollution Control Committee.

The measures include a ban on industries using coal and biomass, brick kilns, construction activities and entry of trucks into Delhi. The restrictions exclude power plants and waste to energy plants.