World most polluted cities 2018 (PM2.5)
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2018 World air quality report
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PM2.5 Legend 
WHO target
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
Very unhealthy
Hazardous
Unit: µg/m³
| Rank | City | 2017 AVG | 2018 AVG | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2101 |  Harlington, United Kingdom | 9.7 | 9.5 | 8.8 | 9.7 | 11.8 | 11.2 | 13.5 | 8.6 | 8.6 | 4.9 | 5.5 | 7.9 | 13 | 8.5 |
| 2102 |  Thompson Falls, USA | - | 9.5 | 7.8 | 7.6 | 6 | 7.8 | 5 | 3 | 6.6 | 25.9 | 5.7 | 8.6 | 20.9 | 8.2 |
| 2103 |  Cockburn, Australia | - | 9.4 | - | - | 9.2 | 6.7 | 15.3 | 9.6 | - | 7 | 7.7 | 7.9 | 11.1 | 8.7 |
| 2104 | McCalla, USA | 9.3 | 9.4 | 8.1 | 7.6 | 8.6 | 8.8 | 11.4 | 12.3 | 10.8 | 10.8 | 8.2 | 8.8 | 6.2 | - |
| 2105 | Corpus Christi, USA | 8.7 | 9.4 | 5.9 | 7.6 | 10 | 8 | 10.6 | 14.3 | 18.1 | 11.2 | 6.2 | 7.2 | 6.8 | 6.6 |
| 2106 | Louisville, USA | 8.8 | 9.4 | 9.4 | 8.6 | 7.1 | 6.3 | 9.4 | 9.8 | 10.8 | 11.7 | 7.2 | 7.8 | 13.1 | 11.8 |
| 2107 |  Sumoto, Japan | 9.3 | 9.4 | 7.8 | 10.7 | 12.1 | 12.2 | 10.2 | 8.6 | 11.1 | 8.1 | 7.2 | 8 | 8.9 | 7.6 |
| 2108 | Isahaya, Japan | 14.6 | 9.4 | 13.5 | 11.5 | 12.2 | 15 | 8.7 | 6.6 | 7.3 | 5.5 | 5 | 7.7 | 11.3 | 8.6 |
| 2109 | New Orleans, USA | 9.5 | 9.4 | 7.3 | 7.5 | 8.9 | 8.3 | 9.5 | 11.4 | 14.8 | 13.2 | 9.7 | 8.9 | 8.6 | 5.3 |
| 2110 |  Battipaglia, Italy | 9.7 | 9.4 | - | - | 9.5 | 9.4 | 10.8 | 7.2 | 9.8 | 10.2 | 8.3 | 7.4 | 6.5 | 13.2 |
| 2111 | Chicago, USA | 6.7 | 9.4 | 5.8 | 8.9 | 6.7 | 7 | 9.1 | 9 | 9.1 | 15.7 | 9.6 | 9 | 9.7 | 12.2 |
| 2112 | Miura, Japan | 8.9 | 9.4 | 7.2 | 8.4 | 10.1 | 11.8 | 9.7 | 8.1 | 9.9 | 10.4 | 8.9 | - | - | 8.2 |
| 2113 | Huntsville, USA | 9.4 | 9.4 | 7.1 | 7.4 | 9.1 | 8.9 | 12 | 11.4 | 12.2 | 12.9 | 8.3 | 8.7 | 7.9 | 7.6 |
| 2114 | Minamiuonuma, Japan | 9.9 | 9.4 | 8.3 | 9.6 | 11.2 | 13.9 | 12.3 | 11 | 12.7 | 7.2 | 6 | 7.1 | 7.2 | 5.5 |
| 2115 | Oyabe, Japan | 8.9 | 9.4 | 6.6 | 9.4 | 12.4 | 14.2 | 12.1 | 10.7 | 12.2 | 7.2 | 6.4 | 7.4 | 7.3 | 5.8 |
| 2116 | Hitachinaka, Japan | 8.9 | 9.4 | 7.4 | 9.2 | 11.7 | 12.3 | 11.4 | 7.9 | 11.2 | 9.6 | 5.7 | 7.4 | 8.8 | 8.2 |
| 2117 |  Ashburton, New Zealand | 11.7 | 9.4 | 5.9 | 4.3 | 5.7 | 8.4 | 11.6 | 15.2 | 16.5 | 12.9 | 10.7 | 7.8 | 5.2 | 5.9 |
| 2118 | Shonai, Japan | 9 | 9.4 | 5.8 | 7 | 11.9 | 13.2 | 12.8 | 9.6 | 13.3 | 8 | 7.8 | 7.5 | 6.5 | 4.7 |
| 2119 |  Saint-Chamond, France | 11 | 9.4 | 8 | 17.5 | 7.5 | 6.2 | 8.8 | 5.5 | 7.8 | 6.6 | 7.1 | 13.3 | 13.2 | 13 |
| 2120 | Baytown, USA | 10 | 9.4 | 8.1 | 9.7 | 12.3 | 9.6 | 10.3 | 11.3 | 15.8 | 10.7 | 5.8 | 5.6 | 6.4 | 6.7 |
| 2121 | Shibata, Japan | 9 | 9.4 | 7.1 | 9.4 | 12.9 | 14.9 | 12.5 | 10 | 12.3 | 6.7 | 6.1 | 7.2 | 7.3 | 6 |
| 2122 | Thousand Oaks, USA | 9.2 | 9.4 | 8.2 | 7.3 | 5.7 | 10.6 | 9 | 11.9 | 10 | 12.5 | 11.2 | 7.6 | 10.7 | 7.4 |
| 2123 | Detroit, USA | 9.1 | 9.4 | 9.9 | 8.9 | 8.7 | 8.3 | 10.2 | 10.9 | 11.2 | 11.5 | 9 | 7.6 | 8.2 | 9.2 |
| 2124 | Little Rock, USA | 9.6 | 9.4 | 7.5 | 6.9 | 9 | 7.9 | 10.5 | 10.6 | 15.8 | 12.3 | 9 | 7.4 | 7.8 | 7.7 |
| 2125 | Allentown, USA | 9 | 9.3 | 14.9 | 11.8 | 8.5 | 8.9 | 8.6 | 7.8 | 8.9 | 9.5 | 3.6 | 3.7 | 7.6 | 11.7 |
| 2126 | Shingu, Japan | 9.4 | 9.3 | 6.9 | 9.3 | 10.9 | 12.8 | 10.7 | 7.5 | 12.3 | 10.8 | 7.8 | 7.7 | 7.3 | 7 |
| 2127 | Sault Ste. Marie, USA | 7.7 | 9.3 | 8.6 | 11.2 | 11 | 8.7 | 10.7 | 8.8 | 11.9 | 10.3 | 4.1 | 4 | 7.6 | 10.4 |
| 2128 | Midlothian, USA | 9.2 | 9.3 | 7 | 8.1 | 9.1 | 8.7 | 10.3 | 11.8 | 17.8 | 12.5 | 9.1 | 5.7 | 6 | 6 |
| 2129 | Philadelphia, USA | 9.6 | 9.3 | 10.9 | 10.9 | 6.8 | 7.6 | 9.8 | 12.3 | 9.9 | 10.6 | 6.5 | 8.2 | 8.6 | 10 |
| 2130 | Lebanon, USA | 12.5 | 9.3 | 14.2 | 10.8 | - | 6.8 | 9.8 | 8.7 | 9.7 | 10 | 7 | 6.8 | 7.5 | 10.5 |
| 2131 | Wilder, USA | 10.1 | 9.3 | 8.8 | - | - | - | - | - | 9.1 | 11.1 | 6.9 | 7.4 | 11.7 | 10.5 |
| 2132 | Reading, United Kingdom | 9.3 | 9.3 | 9.9 | 9.5 | 12.8 | 11.4 | 14.4 | 7.9 | 8.2 | 4.8 | 6.1 | 6.8 | 11.2 | 9.2 |
| 2133 | New Paris, USA | 8 | 9.3 | 8.5 | 10.1 | 6.7 | 7.4 | 11.2 | 10.4 | 10.9 | 11.9 | 7.4 | 7.6 | 10.1 | 9.8 |
| 2134 | Warner Robins, USA | 9.6 | 9.3 | 8.6 | 7.2 | 16.2 | 9 | 9.8 | 10 | 10.1 | 9.4 | 7.3 | 8.7 | 7.7 | 8.6 |
| 2135 |  Belau, Germany | 9.4 | 9.3 | 10 | 14.3 | 17.3 | 16.7 | 9 | 5.5 | 5.6 | 4.5 | 4.5 | 8.7 | 13 | 7.4 |
| 2136 | Leavenworth, USA | 8.4 | 9.3 | 10 | 6.3 | 4.6 | 2.8 | 3.6 | 2.5 | 6 | 37.3 | 5.3 | 8.4 | 13.3 | 10.7 |
| 2137 | Niimi, Japan | 9.1 | 9.3 | 7.4 | 8.9 | 11.3 | 14.7 | 12.3 | 10.9 | 11.6 | 7 | 6 | 6.9 | 7.9 | 6.4 |
| 2138 | New Norfolk, Australia | 11.2 | 9.3 | 2.7 | 2.4 | 3 | 8.7 | 14.1 | 20.1 | 19.8 | 16 | 9.1 | 4.5 | 2.4 | 2.2 |
| 2139 |  Calamba, Philippines | - | 9.3 | 11.3 | 14.8 | 12.5 | 10.4 | 11.2 | 15.4 | 12.9 | 7.2 | 4.8 | 5.5 | 2.9 | 2.8 |
| 2140 | Vannes, France | 9.6 | 9.3 | 8 | 12.3 | 8.7 | 8.8 | 11.5 | 8.8 | 7.5 | 5.6 | 6 | 8 | 13.6 | 13.1 |
| 2141 |  Altay, China | 12.6 | 9.3 | 19.4 | 15.6 | 9.4 | 6.5 | 7.6 | 9.1 | 7.8 | 7 | 7.8 | 6.3 | 6.6 | 8.3 |
| 2142 |  Oural, Spain | 11.6 | 9.3 | 8.2 | 10.1 | 6.7 | 9.3 | 12.4 | 8.4 | 10.4 | 9.8 | 8.6 | - | - | - |
| 2143 | Nasukarasuyama, Japan | 9.5 | 9.3 | 7 | 7.8 | 10.2 | 11.8 | 11.4 | 10.3 | 13.3 | 10.1 | 6.8 | 6.6 | 7.3 | 7.4 |
| 2144 |  Taitung, Taiwan | 9.3 | 9.3 | 9.6 | 10.5 | 11.7 | 11.3 | 9.9 | 9.2 | 8.7 | 8.2 | 7.3 | 9.8 | 7.3 | 7.9 |
| 2145 | Saint-Germain-sur-Rhone, France | 9.5 | 9.3 | 8.5 | 15.9 | 10 | 8.9 | 8.5 | 6.3 | 8.6 | 7.4 | 7.2 | 10.8 | 11.2 | 10 |
| 2146 |  Vaestra Hagen, Sweden | 3.3 | 9.3 | - | - | 9.1 | 12.6 | 10.4 | 6.2 | 8.3 | 6 | 8.5 | 11.6 | 12.1 | 8.5 |
| 2147 | Preston, United Kingdom | 8.7 | 9.3 | 9.3 | 10.1 | 12.4 | 11 | 12.1 | 7.5 | 7.6 | 6.6 | 6 | 7.3 | 12.1 | 10.5 |
| 2148 | Crestline, USA | 11.4 | 9.3 | 9.6 | 8.4 | 6.9 | 10.5 | 9 | 10.5 | 11.8 | 12.8 | 7.5 | 6.9 | 9 | 8.3 |
| 2149 |  Palmela, Portugal | 13.5 | 9.3 | 7 | 7.7 | 5.3 | 8.7 | 10.6 | 8.8 | 13.1 | 14.5 | 12 | 9.4 | 4.9 | 9.8 |
| 2150 | Perth, Australia | 9.7 | 9.3 | 3 | 1.7 | 2.1 | 11 | 14.3 | 27.5 | 16 | 14.4 | 6.9 | 4.2 | 2 | 1.8 |
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