Michael Kleinman reported having received remuneration from a commercial entity or other organization with an interest related to air pollution and having provided an expert opinion or testimony as part of a regulatory, legislative or ju- dicial process related to air pollution. Gunnar Nielsen reported having provided an expert opinion or testimony as part of a regulatory, legislative or judicial process related to the subject of air pollution for a commercial entity or other organization. David G. Penney has given numerous testimonies on safe levels of carbon mon- oxide. The potential interest was judged by WHO as being insignificant for the guidelines.
