Hussain S, Parker S, Edwards K, et al. - In this prospective, single-center panel study, researchers examined 28 adults with asthma and house dust mite sensitization in order to investigate whether a link exists between overnight particulate matter exposure and day-to-day symptoms, lung function, and airway inflammation in these individuals. They used a commercially available indoor air quality monitor to measure overnight exposure to particulate matter. Measurements and daily electronic recording of symptom scores, peak expiratory flow, and exhaled nitric oxide were carried out. Since findings revealed no significant links between overnight particulate matter exposure and clinical results assessed daily or at study visits, it appeared that daily asthma control in patients with asthma and house dust mite sensitization is not largely determined by natural variability in overnight particulate matter exposure.