CBC News: High carbon dioxide levels indicate poor air quality, which can cause health concerns, engineer says... HVAC engineer Joey Fox says schools should have only 1,000 parts per million of carbon dioxide, but several New Brunswick schools exceeded that, with one peaking at 3,914... Data recently released by the Department of Education shows [37 schools had peak … [Read more...] about “As a parent, I would be concerned,” air quality expert says of N.B. school results