The air quality of Delhi and adjoining areas on Wednesday again slipped into "very poor" zone and the experts say it will continue to remain so for at least next three days.

New Delhi Municipal Council (NDMC) on Saturday launched a Public Bicycle Share (PBS) service in order to bridge the gap of the last-mile-connectivity and reduce pollution.

Air quality in Delhi and adjoining regions improved from "severe" to "very poor" on Wednesday as wind speed picked up due to western disturbance over north India and dispersed pollutants.

With quality of air oscillating between "poor" and "very poor", the National Green Tribunal (NGT) on Monday asked the Delhi government to deposit Rs 25 crore with the Central Pollution Control Board (CPCB) for its failure to curb air pollution in the city.

Delhi and the National Capital Region (NCR) on Sunday witnessed 'very poor' air quality with the minimum temperature recorded at 12.4 degrees Celsius, two notches below the season's average, the Met office said.

Wind directions changed by Tuesday noon, creating an outlet for the toxic air over the Delhi-NCR region and thereby improving the air quality to "very poor," from "severe" in the morning and "emergency" a day before.

The national capital and the areas around experienced the first smog episode of this season as the city turned into gas chamber two days before Diwali with air quality placed in "emergency" or "beyond-severe" category.