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Table 3 Concentration of organic acids (sum of formic acid and acetic acid) in one storage building with mechanical ventilation (I), two rooms in another storage building with semi-passive climate control (II) and outdoor

From: Quantification of formic acid and acetic acid emissions from heritage collections under indoor room conditions. Part I: laboratory and field measurements

Concentration (µg m−3)


Storage I

Storage II –archival collections

Storage II –mixed materials



7 (6 °C)

3 (9 °C)

28 (9 °C)



15 (14 °C)

9 (17 °C)

97 (15 °C)


  1. The measurements were conducted in winter and summer. In parentheses the temperature is given for each occasion (monthly average), except for outdoors