Amid a likely increase in pollution levels, the Centre's air quality panel on Saturday directed authorities in the National Capital Region to increase parking fees to discourage private transport and enhance the services of CNG or electric buses and metro trains. The action comes as part of 'Stage II' of the central government's pollution control plan known as the 'Graded Response Action Plan' (GRAP), which is implemented in the Delhi-NCR to combat air pollution during the winter season.