A Personalized Mobile Application Providing Temperature-Related Health Risk Warnings and Protective Recommendations for Patients With Chronic Obstructive Pulmonary Disease

Hospital inclusion criteria: 1. Tertiary hospitals; 2. Hospitals with respiratory wards that admit patients with COPD; 3. Hospitals with a well-established electronic health record system and follow-up capability; 4. Hospitals able to assign a study coordinator. Patient inclusion criteria: 1. Age \>=40 years and \<=80 years, with no restriction on sex; 2. Patients with stable chronic obstructive pulmonary disease; 3. At least 1 severe acute exacerbation requiring hospitalization, or at least 2 moderate acute exacerbations requiring outpatient or emergency care, within the previous year; 4. Local permanent residents with a duration of residence \>=6 months; 5. Patients who voluntarily agree to participate, are expected to have good adherence, are able to sign informed consent; 6. Patients who own a smartphone or other smart device. Hospital exclusion criteria: 1. Primary hospitals or private hospitals; 2. Hospitals unable to cooperate with the study protocol. Patient exclusion criteria: 1. Patients with asthma; 2. Women who are known to be pregnant or breastfeeding, or who have a positive pregnancy test before cluster randomization; 3. Patients with other diseases that may affect participation in the trial, such as refractory hypertension or severe aphasia; 4. Patients currently receiving psychiatric or psychological treatment that may contaminate study results; 5. Expected survival time \<1 year, such as in those with malignant tumors or severe cardiopulmonary disease; 6. Participation in other interventional clinical studies that may affect outcome assessment; 7. Any other circumstances in which the investigator considers the patient unsuitable for participation in this study or at significant risk, such as cognitive impairment preventing understanding of and/or compliance with study procedures and/or follow-up.