de Miguel-Díez J, et al. - Researchers examined how air pollution levels and climatological factors influence hospital admissions for exacerbation of chronic obstructive pulmonary disease (COPD) in Spain from 2004 to 2013. For this retrospective study, they obtained information on the pollution level and climatological factors from the Spanish Meteorological Agency and hospitalizations from the Spanish hospital discharge database. For COPD exacerbation, over 160,000 hospital admissions were identified. Observations revealed a negative effect of colder climatological factors (seasonality and absolute temperature) and short-term exposure to major air pollution (NO₂, O₃, CO, and PM₁₀) on epidemiology of hospital admissions by COPD exacerbation.