The National Museum of the American Indian conservation department has recently published research on rapid air exchange for reducing napthalene concentration aka mothball smell, through not too challenging technical means! They are working on a fuller publication but a brief writeup is available. Hopefully you can access this publication through ILL, however if you need assistance in obtaining it, do send a note and our librarians can assist. Susan Heald and Odile Madden. 2011. Investigations into Naphthalene Mitigation on Museum Objects, in Pulling Together in the 21st Century, Preprints of the 8th North American Textile Conservation Conference, Oaxaca, Mexico. November 8-11, 2011.