The Playbook provides background information and resources to guide more environmentally sustainable inhaler practices in inpatient settings. The content of this playbook, including its associated resources, has been developed by the Critical Air Project (CAP) at the Royal Jubilee Hospital, part of Island Health in Victoria, British Columbia. The Critical Air Project, which has been led by Dr. Valeria Stoynova and Dr. Celia Culley, is a climate-conscious inhaler initiative aimed at decreasing Island Health’s inhaler-related carbon footprint through changes in health policy, operational changes and a widespread educational campaign. The project, which is ongoing, was initiated in April 2022 with support from CASCADES.