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Abstract Environmental air pollution presents a considerable risk to global respiratory health. If critical levels are exceeded, inhaled pollutants can lead to the development of respiratory dysfunction and provoke exacerbation in those with pre‐existing chronic respiratory disease. Over 90% of the global population currently reside in areas where environmental air pollution is considered excessive—with adverse effects ranging from acute airway irritation to complex immunomodulatory alterations. This narrative review provides an up‐to‐date perspective concerning the impact of environmental air pollution on respiratory health and function and describes the underpinning mechanisms that contribute to the development and progression of chronic respiratory disease.