Běijīng zhè jǐ nián kōngqì zhìliàng gǎishàn le bùshǎo.
Beijing's air quality has improved a lot in recent years.
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Daily-life vocabulary in China, where the 空气质量指数 (AQI) is checked on weather apps alongside temperature. PM2.5 readings became a household topic after the 2013 'airpocalypse' over northern China.
