english: Compared to last year , the average of the proportion in standard 13 cities of Beijing, Tianjin region fell by 48.6 percent to 42.6 percent , 6.0 percentage points lower, the air quality has declined.
non_english: Dibandhingake taun pungkasan, rata-rata saka babagan ing standar 13 kutha Beijing, wilayah Tianjin ambruk dening 48,6 persen kanggo 42,6 persen, 6.0 nilai persentasi ngisor, kualitas udhara wis nolak.