
LET'S AIR
@nousaerons
News, scientific mediation and infographics on ventilation & indoor air quality. letsair.org (in 🇬🇧) & nousaerons.fr (in 🇫🇷). Also on BlueSky.
ID: 1379037129314025474
https://letsair.org 05-04-2021 11:45:03
4,4K Tweet
6,6K Followers
497 Following

In 1888, S.H. Woodridge was already teaching at Massachusetts Institute of Technology (MIT) how to ensure good indoor ventilation by measuring CO2 levels. The thresholds he recommended are almost identical to those recommended in 2025 (we've updated the 1888 values because the outdoor CO2 level was then 300ppm).




An excellent introduction to decentralized mechanical ventilation has been produced by the English company Breathing Buildings in this document: breathingbuildings.com/wp-content/upl… Very clear drawings make it easy to understand the proposed solutions. Thanks to chris iddon for reporting the company.



The Salamanca City Central School District - the only district in New York state - is among the 10 selected to receive $50,000 in grant funding and technical assistance to develop and implement board-approved IAQ Management and greenhouse gas emissions reduction. salamancapress.com/2025/06/23/sal…






