Around 300,000 carbon dioxide monitors are to be made available to schools in England next term to help improve ventilation and lessen Covid outbreaks.
The Department for Education said the portable monitors could be used to identify areas where more air-flow is needed.
Teaching unions have been calling for urgent extra ventilation measures.
They welcomed the pledge, but added any ventilation needs picked up by the monitors must be acted upon.
Most Covid safety restrictions have been relaxed in England’s schools. Neither masks, bubble groups nor socially distancing rules are required this coming term.
Many schools have been opening windows and doors to keep air moving around classrooms to lessen the likelihood of Covid outbreaks, but this is easier in warmer weather.
Pupils will be offered twice weekly Covid testing and two tests at school when the autumn term starts to lessen the amount of infection coming into school.
However, those who have come into contact with a confirmed case will no longer have to isolate.
The removal of restrictions has left teachers and some parents concerned that the mass-mixing of pupils may lead to a spike in Covid cases.
Education Secretary Gavin Williamson said: “Providing all schools with CO2 monitors will help them make sure they have the right balance of measures in place, minimising any potential disruption to education and allowing them to focus on world class lessons and catch up for the children who need it.
“By keeping up simple measures such as ventilation and testing, young people can now enjoy more freedom at school and college,” he added.