New Delhi, Dec. 19 -- The Union environment ministry has proposed to constitute a four-member expert panel to work on ozone (O3) pollution to assess ways to mitigate its ill-effects and also assess its long and short-term health impact. The proposal, made in an affidavit to the National Green Tribunal (NGT) on December 16, said the ministry has finalised the terms of reference (ToR) for the panel, in consultation with the Central Pollution Control Board (CPCB). The panel, once formed, will prepare a report on the issue within two months, it said. "That, in compliance with the aforesaid directions, the answering respondent, in consultation with the Central Pollution Control Board (CPCB), has prepared the proposed ToR for the expert committee...