Fig. 1From: Quantification of formic acid and acetic acid emissions from heritage collections under indoor room conditions. Part I: laboratory and field measurementsArea-specific emission rates of formic acid and acetic acid at 20% RH and constant temperature (23 ± 2 °C) as well as at 10 and 23 °C with constant RH (50 ± 5% RH). The cross indicates measurements that are below the LOQ of 5 µg m−3Back to article page