Raven created a site where anyone can submit CO2 readings for public spaces on specific times and dates. This data is placed on a map and is available for anyone to view. This is an amazing project making use of citizen science and collaborate data for public engagement and education into air quality issues.
Check out the App for CO2 readings and contribute to the site HERE!

“Co-founded by U of T alum Muzammil Syed (IMS, 2022), the Raven Clean Air Map is a global map that allows users to log the CO2 levels of public spaces. The fresher the air in a school, workplace or shop, the lower the CO2 level and the less likely you’ll get COVID-19, and other airborne diseases.“
More info can be found on the University of Toronto Site.
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