SmogRank / History / January 2025

Most polluted cities, January 2025

1,841 cities ranked by their average PM2.5 over the 31 days. A city needs measurements on 70% of the days to be ranked.

#	City	µg/m³
1	Delhi Delhi, India	172.9
2	Dushanbe Dushanbe, Tajikistan	112.0
3	Mumbai Maharashtra, India	94.0
4	Sarajevo Federation of B&H, Bosnia and Herzegovina	72.4
5	Banja Luka Srpska, Bosnia and Herzegovina	66.5
6	Chennai Tamil Nadu, India	61.6
7	Codlea Brașov County, Romania	54.3
8	Yerevan low-cost sensors Yerevan, Armenia	54.2
9	Dej Cluj County, Romania	46.1
10	Żywiec Silesia, Poland	38.5
11	Accra low-cost sensors Greater Accra, Ghana	38.0
12	Haskovo low-cost sensors Haskovo, Bulgaria	37.2
13	Dimitrovgrad low-cost sensors Haskovo, Bulgaria	36.6
14	Botevgrad low-cost sensors Sofia, Bulgaria	35.8
15	Istanbul low-cost sensors Istanbul, Turkey	34.8
16	Thessaloníki Central Macedonia, Greece	34.4
17	Tuen Mun Tuen Mun, Hong Kong	33.0
18	Zgierz Łódź Voivodeship, Poland	32.2
19	Sevlievo low-cost sensors Gabrovo, Bulgaria	31.6
20	Wan Chai Wan Chai, Hong Kong	31.3
21	Kazincbarcika Borsod-Abaúj-Zemplén, Hungary	31.2
22	Craiova Dolj, Romania	31.1
23	Cluj-Napoca Cluj County, Romania	30.3
24	Fengshan Takao, Taiwan	30.1
25	Miskolc Borsod-Abaúj-Zemplén, Hungary	30.0
25	Otwock Mazovia, Poland	30.0
27	Kaohsiung Takao, Taiwan	29.6
28	Baku Baki, Azerbaijan	29.5
29	Bielsko-Biala Silesia, Poland	29.2
30	Ružomberok Žilina Region, Slovakia	29.0
31	Chaozhou Taiwan, Taiwan	28.9
32	Kraków Lesser Poland, Poland	28.8
33	Bucharest Bucharest, Romania	28.4
34	Kielce Świętokrzyskie, Poland	28.1
35	Jincheng Fukien, Taiwan	27.8
35	Liptovský Mikuláš Žilina Region, Slovakia	27.8
37	Augustów Podlasie, Poland	27.6
37	Tin Shui Wai Yuen Long, Hong Kong	27.6
37	San Tung Chung Hang Islands, Hong Kong	27.6
40	Opole Opole Voivodeship, Poland	26.9
41	Tai Po Tai Po, Hong Kong	26.5
41	Manlleu Catalonia, Spain	26.5
41	Ciudad Nezahualcoyotl México, Mexico	26.5
44	Kranj Urban Municipality of Kranj, Slovenia	26.2
45	Mong Kok Yau Tsim Mong District, Hong Kong	26.1
46	Douliu Taiwan, Taiwan	25.8
47	Gabrovo low-cost sensors Gabrovo, Bulgaria	25.5
48	Lučenec Banská Bystrica Region, Slovakia	25.3
49	Chiayi City Taiwan, Taiwan	25.2
50	Czechowice-Dziedzice Silesia, Poland	24.9
51	Lublin Lublin, Poland	24.8
51	Tainan Taiwan, Taiwan	24.8
53	Yongkang Taiwan, Taiwan	24.7
53	Łask Łódź Voivodeship, Poland	24.7
55	Iaşi Iași County, Romania	24.6
55	Tsuen Wan Tsuen Wan, Hong Kong	24.6
55	Badger Alaska, United States	24.6
58	Kwai Chung Kwai Tsing District, Hong Kong	24.5
59	Włocławek Kujawsko-Pomorskie, Poland	24.4
60	Xinying Taiwan, Taiwan	24.1
61	Košice Košice Region, Slovakia	23.8
61	Sham Shui Po Sham Shui Po District, Hong Kong	23.8
61	Fresno California, United States	23.8
64	Hanford California, United States	23.7
65	Silao de la Victoria Guanajuato, Mexico	23.6
66	Erlun Taiwan, Taiwan	23.5
66	Celje Urban Municipality of Celje, Slovenia	23.5
68	Fanling North District, Hong Kong	23.4
68	Victoria Central and Western, Hong Kong	23.4
70	Racibórz Silesia, Poland	23.3
71	Sau Mau Ping Kwun Tong District, Hong Kong	23.2
72	Dębica Subcarpathia, Poland	23.1
72	Łódź Łódź Voivodeship, Poland	23.1
74	Addis Ababa Addis Ababa, Ethiopia	23.0
75	Starachowice Świętokrzyskie, Poland	22.9
75	Nisko Subcarpathia, Poland	22.9
77	Zhushan Taiwan, Taiwan	22.7
77	Martin Žilina Region, Slovakia	22.7
77	Kalisz Greater Poland, Poland	22.7
80	Púchov Trenčín Region, Slovakia	22.6
81	Nyíregyháza Szabolcs-Szatmár-Bereg, Hungary	22.5
81	Gorizia Friuli Venezia Giulia, Italy	22.5
81	Irapuato Guanajuato, Mexico	22.5
84	Jastrzębie Zdrój Silesia, Poland	22.1
85	Zamość Lublin, Poland	22.0
85	Radom Mazovia, Poland	22.0
87	Sha Tin Sha Tin, Hong Kong	21.9
87	Kłodzko Lower Silesia, Poland	21.9
87	Mexico City Mexico City, Mexico	21.9
90	Murcia Murcia, Spain	21.8
90	Molina de Segura Murcia, Spain	21.8
90	Žilina Žilina Region, Slovakia	21.8
93	Brzeg Opole Voivodeship, Poland	21.6
94	Compton California, United States	21.4
95	Warsaw Mazovia, Poland	21.2
95	Yuanlin Taiwan, Taiwan	21.2
97	Żyrardów Mazovia, Poland	20.9
97	Beigang Taiwan, Taiwan	20.9
99	Wawer Mazovia, Poland	20.8
100	Klagenfurt am Wörthersee Carinthia, Austria	20.7
100	Zvolen Banská Bystrica Region, Slovakia	20.7
100	Kędzierzyn-Koźle Opole Voivodeship, Poland	20.7
100	Novo Mesto Urban Municipality of Novo Mesto, Slovenia	20.7
100	Visalia California, United States	20.7
105	Asprópyrgos Attica, Greece	20.6
105	Prešov Prešov Region, Slovakia	20.6
105	Aberdeen Southern District, Hong Kong	20.6
108	Radomsko Łódź Voivodeship, Poland	20.5
108	Phoenix Arizona, United States	20.5
110	Hawthorne low-cost sensors California, United States	20.4
111	Pruszków Mazovia, Poland	20.3
111	Los Angeles California, United States	20.3
113	Legionowo Mazovia, Poland	20.1
113	Nantou Taiwan, Taiwan	20.1
115	Acharnés Attica, Greece	20.0
115	Taibao Taiwan, Taiwan	20.0
115	Čadca Žilina Region, Slovakia	20.0
115	Poznań Greater Poland, Poland	20.0
119	Konstancin-Jeziorna Mazovia, Poland	19.9
119	Katowice Silesia, Poland	19.9
121	Ptuj Urban Municipality of Ptuj, Slovenia	19.8
121	Nogales Arizona, United States	19.8
123	Toruń Kujawsko-Pomorskie, Poland	19.7
124	Rzeszów Subcarpathia, Poland	19.6
124	Przemyśl Subcarpathia, Poland	19.6
124	San Luis de la Paz Guanajuato, Mexico	19.6
127	Mielec Subcarpathia, Poland	19.5
127	Trbovlje Municipality of Trbovlje, Slovenia	19.5
129	Banská Bystrica Banská Bystrica Region, Slovakia	19.4
129	Bakersfield California, United States	19.4
131	Jelenia Góra Lower Silesia, Poland	19.3
131	Ljubljana Ljubljana, Slovenia	19.3
133	Trebišov Košice Region, Slovakia	19.2
133	Pécs Baranya, Hungary	19.2
135	Corcoran California, United States	19.1
136	Ourense Galicia, Spain	19.0
136	Carson low-cost sensors California, United States	19.0
138	Ingolstadt Bavaria, Germany	18.9
139	Erlin Taiwan, Taiwan	18.8
139	Prievidza Trenčín Region, Slovakia	18.8
141	Traun Upper Austria, Austria	18.7
142	Olsztyn Warmia-Masuria, Poland	18.6
142	Wolfsberg Carinthia, Austria	18.6
142	Wrocław Lower Silesia, Poland	18.6
142	Tijuana Baja California, Mexico	18.6
146	Graz Styria, Austria	18.5
147	Ciechanów Mazovia, Poland	18.4
148	Buzi Taiwan, Taiwan	18.3
148	Passau Bavaria, Germany	18.3
150	Maribor Urban Municipality of Maribor, Slovenia	18.2
151	Bardejov Prešov Region, Slovakia	18.1
151	Esztergom Komárom-Esztergom, Hungary	18.1
151	Pezinok Bratislava Region, Slovakia	18.1
154	Taichung Taiwan, Taiwan	17.9
155	Izegem Flanders, Belgium	17.8
156	Vranov nad Topľou Prešov Region, Slovakia	17.7
156	Linz Upper Austria, Austria	17.7
158	Elbląg Warmia-Masuria, Poland	17.6
159	Changhua Taiwan, Taiwan	17.5
159	Győr Győr-Moson-Sopron, Hungary	17.5
161	Humenné Prešov Region, Slovakia	17.3
161	Clovis California, United States	17.3
163	Jasło Subcarpathia, Poland	17.2
163	Płock Mazovia, Poland	17.2
165	Long Beach California, United States	17.1
165	Torrance low-cost sensors California, United States	17.1
167	Jarosław Subcarpathia, Poland	17.0
167	Le Havre Normandy, France	17.0
167	Handlová Trenčín Region, Slovakia	17.0
167	Koper Urban Municipality of Koper, Slovenia	17.0
171	Hita Oita, Japan	16.9
171	Menen Flanders, Belgium	16.9
173	Magong Taiwan, Taiwan	16.7
173	Stockton California, United States	16.7
175	Białystok Podlasie, Poland	16.6
175	Neili Taiwan, Taiwan	16.6
175	Partizánske Trenčín Region, Slovakia	16.6
178	Žiar nad Hronom Banská Bystrica Region, Slovakia	16.5
178	Trenčín Trenčín Region, Slovakia	16.5
178	Gorzów Wielkopolski Lubusz, Poland	16.5
181	Szeged Csongrád, Hungary	16.4
181	Marignane Provence-Alpes-Côte d'Azur, France	16.4
181	Celaya Guanajuato, Mexico	16.4
184	Ansfelden Upper Austria, Austria	16.3
184	Tübingen Baden-Wurttemberg, Germany	16.3
186	Hsinchu Taiwan, Taiwan	16.2
187	Pylaía Central Macedonia, Greece	16.1
187	Toufen Taiwan, Taiwan	16.1
187	Miaoli Taiwan, Taiwan	16.1
187	Roeselare Flanders, Belgium	16.1
187	Lochristi Flanders, Belgium	16.1
187	Lillehammer Innlandet, Norway	16.1
187	Jurupa Valley California, United States	16.1
194	Wels Upper Austria, Austria	16.0
194	Augsburg Bavaria, Germany	16.0
194	Meylan Auvergne-Rhône-Alpes, France	16.0
194	Gdynia Pomerania, Poland	16.0
194	Modesto California, United States	16.0
199	Ełk Warmia-Masuria, Poland	15.8
199	Nitra Nitra Region, Slovakia	15.8

Top 200 of 1,841 shown.

Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data