Pollution levels during Diwali in the national capital region were the lowest in five years, Delhi Chief Minister Arvind Kejriwal said today, while urging respect for the efforts of the people and the government to contain and solve the problem. Mr Kejriwal also highlighted the mega laser show organised by his government to encourage people to shun firecrackers, green or otherwise, saying it had been well received and would be staged at more venues next year.