noun
photochemical smog advisory; smog alert
Official warning issued when photochemical oxidant concentrations become hazardous, typically in summer.
今日は光化学スモッグ注意報が出ているので、外での運動は控えてください。
A photochemical smog advisory has been issued today, so please refrain from outdoor exercise.
Compound of 光化学 (photochemical), スモッグ (smog), and 注意報 (advisory).