As Delhi's air quality entered the red zone today with the number of farm fires increasing by four times over last year's, Delhi Deputy Chief Minister Manish Sisodia attacked the central government saying all of north India would have to pay for its "inaction on the issue of air pollution". "Pollution and stubble burning are not just issues pertaining to Delhi but this affects the whole of North India. It is a matter of regret that the central government did not take any action during the year, and now the whole country will pay for it," the Aam Aadmi Party leader said.