When the smog is severe, schools will suspend classes.
Tips
memory
霾 stacks 雨 (rain) over 貍 — a phonetic component also found in 狸 (racoon-dog). The rain radical marks it as atmospheric weather; modern Chinese binds it with 雾 (fog) into 雾霾 (smog), the ubiquitous word for China's pollution haze.
culture
Though 霾 is an ancient character found in 《诗经》 (Classic of Poetry), it was obscure until the early 2010s when 雾霾 crises forced it into daily weather forecasts, news tickers, and everyone's vocabulary.
