Leaving an Aranet 4 CO2 logger in a classroom proved that ventilation was not functioning. In some cities you can even borrow one of these meters from the public library! Tag me if you'd like help interpreting the results.

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That means both Scotland & Wales now have accurate guidance, at least on that one point🥳 Of course, there are still huge problems with the Manual. But on this occasion, politely querying an error seems to have done the job! Thank you for listening, ARHAI @nhsnss.bsky.social 🙏

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💥Success💥 is not often a word you hear in connection with attempts to secure positive change to infection prevention and control policy, but I'm delighted to have some to report, having written to point out that it is an error to say no infectious person should wear an FFP3 mask 🧵

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To recap, they seemed to have conflated valved FFP3 masks, which do only filter incoming air, with unvalved FFP3 masks. which filter both incoming/ inhaled and outgoing/ exhaled air (if well-fitted).

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They responded to my query to say "the Guidance Team will review the wording and consider amendments to improve clarity". It seems they did. Here's what it says now 👏 👇

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