Environment Minister Dr. Harsh Vardhan today exhorted the children to spread the message of 'Clean Air' throughout the nation and said the ''Run for Clean Air'' campaign is the harbinger of positive energy for Clean Air. <br/><br/>With Deepawali festivities in the air, Dr. Harsh Vardhan told the gathering of students that the scientists have been asked to develop Zero-pollution fire-crackers that do not cause health hazards to children. <br/><br/>Flagging off the ''Run for Clean Air campaign'' from India Gate lawns in New Delhi today, Harsh Vardhan said 'the ill-effects of pollution cause the maximum problems for children. <br/><br/>He added that combating pollution and protecting the environment can be effectively done through small steps by each and every citizen of the nation. The Minister pointed out that when children take a pledge, they ensure that the campaign becomes a success. He also administered a Pledge to promote Clean Air on the occasion.