health friendly air is just back from a hugely successful international conference on healthy buildings and indoor environment, Healthy Buildings 2009 in Syracuse, New York. The conference was attended by a multidisciplinary mix of over 800 scientists, policy makers, clinicians, industry leaders and practitioners and hosted the presentation of over 500 research papers. The major topics of discussion were indoor environmental quality, performance & productivity, health, indoor contaminants and design & assessment. There was an interesting emphasis on the key role that bioaerosols such as mould and allergens play in indoor air quality and building occupant health with agreement that there is a need for international agreement on the best sampling approach and guidelines for appropriate indoor levels. To this a conference focusing on bioaerosols will take place in NY next Sept. 2010.