Shanghai Air, also known as Shanghai haze or smog, refers to the heavily polluted air often experienced in the city of Shanghai, China. Synonyms for Shanghai Air include "polluted air", "toxic fog" or "hazy atmosphere". These terms describe the environmental condition characterized by high levels of air pollution caused by industrial emissions, vehicle exhaust, and atmospheric factors. The consequential poor air quality can lead to various health issues, including respiratory problems, allergies, and reduced visibility. The term Shanghai Air has gained recognition due to the city's struggle with pollution, and its synonyms serve as alternative phrases to highlight this pressing environmental concern.