noun, noun which may take the genitive case particle 'no'
Refers to extremely hot weather, often used in formal or written contexts such as news reports. Can be used as a noun or as a no-adjective to modify other nouns.
今年の夏は記録的な炎暑が続いている。
This summer, record-breaking intense heat continues.
炎暑の日には、外での運動は避けたほうがいい。
On days of intense heat, it's better to avoid exercising outside.
Compound of 炎 (flame, blazing) and 暑 (heat). The combination suggests heat so intense it feels like flames.