光こう化か学がく汚お染せん

noun

photochemical pollution

Refers to air pollution caused by photochemical reactions, typically involving ozone and other oxidants formed from vehicle and industrial emissions under sunlight.

• 夏なつの日にっ中ちゅうは光こう化か学がく汚お染せんに注ちゅう意いが必ひつ要ようです。

  Be careful of photochemical pollution during summer daytime.

• 光こう化か学がく汚お染せんの原げん因いんは主おもに自じ動どう車しゃの排はい気きガスです。

  The main cause of photochemical pollution is automobile exhaust.