The local authority began an inspection programme for levels of naturally occurring radon gas at 34 schools throughout the region last year in November.
In April, it was revealed measurements at Ardgour Primary School, Carrbridge Primary School and Newtonmore Primary School were in excess of the 400 Bq/m³ Action Level.
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Remedial measures to alleviate the problem have now been announced.
All three schools will have cracks and voids sealed before a further 90 days monitoring.
Three active radon sumps, which use a fan and piping to remove the gas, will be installed at Ardgour, while Carrbridge will have two.
The Highland Council and their specialist radon advisor, working in consultation with Public Health England, the Health and Safety Executive (HSE) and each property Responsible Premises Officer, have examined the results of the previously reported testing and the construction detail of the property and have determined the most appropriate remedial measures to take.
The work is scheduled to be carried out during the summer holidays.
(LM)
