After measuring the concentration of formaldehyde in the air of libraries, shopping centres, train stations, and individual homes, researchers at the Physical Chemistry of the Atmosphere Laboratory and the Pneumology Department of the Strasbourg University Hospitals (France), suggest a new value of between 50 and 60 µg m-3 for chronic exposure, because in 10% of the studied locations, the level of formaldehyde was found to be greater than 50 µg m-3. (The World Health Organisation estimates that 100 µg m-3 for 30 minutes corresponds to acute exposure.)
When asthmatics "... stay at home, they are constantly exposed to low concentrations of formaldehyde over a period of hours and not intermittently for a period of 30 minutes."
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