Midlothian residents have been taking advantage of free vehicle emissions testing in the area.
Councillor Aitchison watches as a vehicle is tested in Midlothian
Roadside tests will continue to be carried out in the area over the next four months.
It is hoped the initiative will help cut both carbon dioxide emissions and the use of fuel.
Cllr Jack Aitchison, environment protection committee chairman, urged more people to take advantage of the free tests.
He said: "There are approximately 34,000 privately owned vehicles in Midlothian.
"This initiative helps both the environment and the car owner by cutting both emissions and fuel usage.
"Although Midlothian Council monitors air quality for pollutants such as carbon monoxide, nitrogen dioxide, sulphur dioxide, hydrocarbons and particulates, perhaps one of the most damaging emissions to the environment is carbon dioxide.
"Carbon dioxide, although not directly harmful to human health, is the most significant of the greenhouse gases contributing to climate change."
The Lothians authorised officer for testing, Tom Logie said: "Our aim is to give feedback to drivers on whether or not their vehicles meet the required limits.
"Advising drivers on possible causes for failing the test will allow them to have the necessary repairs carried out."
Future free emissions testing sessions in Midlothian are being held on 24 July at Sainsbury's in Straiton, 21 August at Tesco in Hardengreen, 18 September at Sainsburys in Straiton and 16 October at Tesco in Hardengreen.