Pencemaran udara adalah bertambahnya bahan atau substrat fisik atau kimia ke dalam lingkungan udara normal yang mencapai sejumlah tertentu, sehingga dapat dideteksi oleh manusia atau yang dapat dihitung dan diukur, serta dapat mengganggu keseimbangan dinamik atmosfer dan mempunyai efek pada manusia, binatang, vegetasi dan material.
Sumber : waqi.info. Diambil : Juni 2019
Kalau anda lihat pada gambar diatas, kota-kota dari negara Cinda dan India merupakan negara dengan tingkat pencemaran udara terburuk di Dunia. Jakarta juga termasuk kota dengan pencemaran udara yang buruk, masuk dalam kategori tidak sehat.
Berikut adalah daftar peringkat kota-kota di Dunia dengan pencemaran udara terburuk, diambil dari data World Health Organization mulai tahun 2008 hingga tahun 2017
| Position | Country | City/Town | Year | PM2.5 | Temporal coverage | PM10 | Temporal coverage | Database version (year) |
|---|---|---|---|---|---|---|---|---|
| 1 | India | Kanpur | 2016 | 173 | >75% | 319 | NA | 2018 |
| 2 | India | Faridabad | 2016 | 172 | >75% | 316 | NA | 2018 |
| 3 | India | Gaya | 2016 | 149 | 50% -< 75% | 275 | NA | 2018 |
| 4 | India | Varanasi | 2016 | 146 | >75% | 260 | NA | 2018 |
| 5 | India | Patna | 2016 | 144 | >75% | 266 | NA | 2018 |
| 6 | India | Delhi | 2016 | 143 | >75% | 292 | NA | 2018 |
| 7 | India | Lucknow | 2016 | 138 | >75% | 255 | NA | 2018 |
| 8 | Cameroon | Bamenda | 2012 | 132 | NA | 141 | NA | 2016 |
| 9 | India | Agra | 2016 | 131 | >75% | 194 | NA | 2018 |
| 10 | India | Gurgaon | 2016 | 120 | 50% -< 75% | 124 | NA | 2018 |
| 11 | India | Muzaffarpur | 2016 | 120 | >75% | 221 | NA | 2018 |
| 12 | Pakistan | Peshawar | 2010 | 111 | NA | 540 | NA | 2016 |
| 13 | Pakistan | Rawalpindi | 2010 | 107 | NA | 448 | NA | 2016 |
| 14 | India | Jaipur | 2016 | 105 | 50% -< 75% | 193 | NA | 2018 |
| 15 | Uganda | Kampala | 2013 | 104 | NA | 170 | NA | 2016 |
| 16 | India | Patiala | 2016 | 101 | NA | 184 | NA | 2018 |
| 17 | India | Jodhpur | 2016 | 98 | >75% | 180 | NA | 2018 |
| 18 | Bangladesh | Narayangonj | 2015 | 94 | >75% | 205 | >75% | 2018 |
| 19 | China | Baoding | 2016 | 93 | NA | 147 | NA | 2018 |
| 20 | Qatar | Doha | 2012 | 93 | NA | 168 | NA | 2016 |
| 21 | Mongolia | Ulaanbaatar | 2016 | 92 | >75% | 197 | NA | 2018 |
| 22 | China | Ji’nan | 2014 | 90 | NA | 192 | NA | 2018 |
| 23 | China | Shijiazhuang | 2015 | 89 | NA | 147 | NA | 2018 |
| 24 | Pakistan | Karachi | 2009 | 88 | NA | 290 | NA | 2016 |
| 25 | China | Hengshui | 2016 | 87 | NA | 143 | NA | 2018 |
| 26 | China | Xingtai | 2016 | 87 | NA | 186 | NA | 2018 |
| 27 | China | Anyang | 2016 | 86 | NA | 155 | NA | 2018 |
| 28 | China | Liaocheng | 2016 | 86 | NA | 151 | NA | 2018 |
| 29 | China | Jiaozuo | 2016 | 85 | NA | 142 | NA | 2018 |
| 30 | Qatar | Al Wakrah | 2012 | 85 | NA | 152 | NA | 2016 |
| 31 | Bangladesh | Khulna | 2015 | 84 | 50% -< 75% | 94 | >75% | 2018 |
| 32 | China | Xinxiang | 2016 | 84 | NA | 144 | NA | 2018 |
| 33 | India | Nagpur | 2016 | 84 | NA | 86 | NA | 2018 |
| 34 | China | Handan | 2016 | 82 | NA | 175 | NA | 2018 |
| 35 | China | Heze | 2016 | 82 | NA | 143 | NA | 2018 |
| 36 | China | Ji’ning | 2015 | 82 | NA | 140 | NA | 2018 |
| 37 | China | Xianyang | 2016 | 82 | NA | 149 | NA | 2018 |
| 38 | Bangladesh | Gazipur | 2015 | 81 | >75% | 143 | >75% | 2018 |
| 39 | China | Dezhou | 2016 | 81 | NA | 141 | NA | 2018 |
| 40 | China | Zaozhuang | 2016 | 81 | NA | 141 | NA | 2018 |
| 41 | Bangladesh | Barisal | 2015 | 80 | >75% | 113 | >75% | 2018 |
| 42 | China | Dongying | 2015 | 79 | NA | 136 | NA | 2018 |
| 43 | China | Luoyang | 2016 | 79 | NA | 130 | NA | 2018 |
| 44 | Kuwait | Al-Ahmadi | 2015 | 79 | >75% | 138 | >75% | 2018 |
| 45 | China | Shouguang | 2014 | 78 | NA | 117 | NA | 2016 |
| 46 | China | Zhengzhou | 2016 | 78 | NA | 143 | NA | 2018 |
| 47 | China | Luohe | 2016 | 77 | NA | 130 | NA | 2018 |
| 48 | China | Shangqiu | 2016 | 77 | NA | 127 | NA | 2018 |
| 49 | China | Weinan | 2016 | 76 | NA | 139 | NA | 2018 |
| 50 | China | Pingdingshan | 2016 | 75 | NA | 125 | NA | 2018 |