Danger in the Air At North Intermmediate School in Wilmington? Is there danger in the air at the North Intermediate School in Wilmington? Apparently carbon dioxide levels have been found to be above acceptable levels in some class rooms. According to a report dated Dec. 9, 1996, by ATC Associations, an independent consulting firm hired by the Town of Wilmington to conduct Indoor Air Quality and Microbiological testing at the school. “All indoor air quality parameters were within normal guideline ranges with the exception of consistently elevated levels of carbon dioxide