It becomes lethal at very high concentrations. The Provincial limit for carbon dioxide is 5000 ppm. At low concentrations, CO2 can cause headaches, nausea, dizziness and fatigue. They generally affect the central and peripheral nervous system and may cause irritation to the mucous membranes even at low concentrations. Total dust found in indoor air is result of construction materials, equipment, furniture, worker s activities and outside sources.
Cigarettes are often the main source of particle emissions.
This is a direct reading instrument that analyses a sample of air every 3 minutes and stores it in its memory. The results are averaged every hour and presented in tables. This tube was then analysed by gas chromatography at McGill University's Environmental Laboratory.