Public tip-offs regarding environmental issues, especially relating to airborne pollution, are on the rise, a report shows, indicating public awareness of the problem has grown.

The number of environmental tips received on official hotline 12369 rose by 26 percent in 2013 over 2012's total, according to information released by the Environmental Protection Ministry on Friday.

More than 70 percent of the tips concerned airborne pollution, 1 percent more than the year before.