1/ Previous analysis by my team of occupied-day average & peak CO2 concentrations in K-8 classrooms in Central Texas and Rio Grande Valley. Results shown as cumulative distribution plots. So, 35% of classrooms w/ CO2 less than 1,000 ppm & 65% greater (note ref on absenteeism). 
2/ 20% of classrooms with average CO2 concentrations greater than 2,000 ppm and peak concentrations greater than 3,000 ppm! Sadly, conditions in the Rio Grande Valley were far worse than in Central Texas (an indoor socio-environmental justice issue). next ....
3/ Mean occupied day CO2 concentration in Central Texas = 1,300 ppm and in RGV = 1,800 ppm with similar disparity for peak values. Also compared portables versus traditional classrooms. more ...
4/ Across the two school districts the mean CO2 concentration was about 150 ppm greater in portable classrooms than in traditional classrooms. This was skewed by tampering w/ AC units in portables in the RGV (often switched off or cardboard & duct tape over inlets).
5/ Two major reasons given. Noise = #1. Energy savings = #2.
Results from early 2000s, but more recent sampling by others suggest little change. Can only hope for better during and post-pandemic.
Results from early 2000s, but more recent sampling by others suggest little change. Can only hope for better during and post-pandemic.
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