Well, I thank Adam Price for that important point. Of course, we have carbon dioxide monitors now available here in Wales and being deployed in schools, but there is more that can be done on ventilation. It is a very important part of the way in which we can keep one another safe. The chief medical officer and the chief nursing officer wrote out to the health service in Wales only in the last few days relaying further advice on the hierarchy of actions that can be taken to make sure that people who work and people who are being treated in our hospitals and other closed settings of that sort are kept as safe as possible, and ventilation was one of the issues that they emphasised in the letter that they have set out. We continue to review the evidence from other parts of the world on actions that can be effective in assisting in schools and in other settings—workplaces, for example, as well as hospitals and care homes—to assist in improving ventilation and monitoring the quality of air. And where there are ideas or practical solutions that we find elsewhere, we'll certainly be open to learning from them and seeing what we can do to support their implementation.