India, Nov. 8 -- While BJP goes on the offensive, AAP argues that it is trying to pin Delhi's pollution woes on Punjab.

With less than a year to go before Punjab elects its next government, pollution is once again featuring in political exchanges between the BJP and the Aam Aadmi Party (AAP).

Despite the annual controversy over stubble burning and its contribution to deteriorating air quality across northern India, the issue has not acquired the prominence of unemployment, drugs, law and order, agricultural distress and the state's financial position in the emerging electoral discourse.

The latest exchange between Delhi Environment Minister Manjinder Singh Sirsa and AAP national convenor Arvind Kejriwal has brought the subject back int...