Aberdeen City Council is owed more than £500,000 in unpaid fines issued to drivers for breaching the city's low emission zone rules.
Large sections of Aberdeen city centre are off-limits to older petrol and diesel vehicles which cause greater emissions, in a scheme designed to improve air quality.
Those in non-compliant vehicles found breaching the rules face a £60 fine, halved if paid within two weeks.
Now, a new report to the local authority, the BBC reports, has revealed the total income, after expenses from the scheme in its first year is £1.23million.
However around £561,000 worth of fines are yet to be recovered, meaning the current income is approximately £669,000.
The report, set to be discussed by council chiefs at a meeting next week, also highlights a drop in the number of charges being issues since the LEZ was first introduced, and a 7% rise in the volume of LEZ-compliant vehicles in the city centre since 2023 - to 89%.
A spokesperson for Aberdeen City Council told the BBC: "The council must accrue any expected but unpaid income at the end of each financial year, in compliance with accounting practice.
"This includes income related to PCNs.
"The £561,000 quoted in the report represents the difference between this accrued position, and the cash position for financial year 2024/25."