SmogRank / Cleaner or dirtier

Cleaner or dirtier: 2025

2,124 measured cities have enough days in both years to compare 2025 with the same days of 2024: 1,505 got dirtier and 550 cleaner. Biggest rise first.

The 50 biggest rises

#	City	2024	2025	Change
1	DushanbeTajikistan	133	158	+16.8 µg/m³+35%
2	Quezon CityNational Capital Region, Philippines	67	80	+7.4 µg/m³+42%
3	ŻywiecSilesia, Poland	69	82	+7.3 µg/m³+39%
4	OnomichiHiroshima, Japan	47	60	+5.2 µg/m³+61%
5	El PasoTexas, United States	55	64	+5.0 µg/m³+45%
6	Shin’ichiHiroshima, Japan	46	59	+5.0 µg/m³+60%
7	WschowaLubusz, Poland	56	66	+4.9 µg/m³+41%
8	WenatcheeWashington, United States	30	53	+4.7 µg/m³+87%
9	AlmatyKazakhstan	76	85	+4.6 µg/m³+20%
10	SinhyeonGyeongsangnam-do, South Korea	52	60	+4.6 µg/m³+48%
11	HaenamJeollanam-do, South Korea	54	62	+4.4 µg/m³+42%
12	MarquetteMichigan, United States	24	49	+4.4 µg/m³+100%
13	ConcónValparaiso, Chile	75	83	+4.3 µg/m³+20%
14	VentspilsLatvia	43	56	+4.0 µg/m³+52%
15	ŁódźŁódź Voivodeship, Poland	61	68	+3.9 µg/m³+27%
16	TakamatsuKagawa, Japan	44	56	+3.8 µg/m³+48%
17	BrookingsSouth Dakota, United States	34	52	+3.7 µg/m³+61%
18	SuperiorWisconsin, United States	34	52	+3.7 µg/m³+61%
19	ObrenovacCentral Serbia, Serbia	73	80	+3.7 µg/m³+18%
20	PristinaKosovo	52	59	+3.7 µg/m³+38%
21	SaguntoValencia, Spain	26	46	+3.6 µg/m³+77%
22	AnacortesWashington, United States	19	39	+3.6 µg/m³+103%
23	Williams LakeBritish Columbia, Canada	17	37	+3.6 µg/m³+120%
24	KariyaAichi, Japan	42	55	+3.5 µg/m³+46%
25	NangenJeollabuk-do, South Korea	56	63	+3.4 µg/m³+29%
26	SpeyerRheinland-Pfalz, Germany	52	58	+3.4 µg/m³+36%
27	DuluthMinnesota, United States	32	51	+3.4 µg/m³+59%
28	SocorroTexas, United States	54	60	+3.3 µg/m³+31%
29	AnanTokushima, Japan	52	58	+3.3 µg/m³+35%
30	VirginiaMinnesota, United States	32	51	+3.3 µg/m³+57%
31	NeuwiedRheinland-Pfalz, Germany	46	56	+3.3 µg/m³+40%
32	OtwockMazovia, Poland	68	74	+3.2 µg/m³+17%
33	HeilbronnBaden-Wurttemberg, Germany	51	57	+3.2 µg/m³+35%
34	HigashinozoeHyōgo, Japan	51	57	+3.2 µg/m³+35%
35	SandpointIdaho, United States	41	54	+3.2 µg/m³+44%
36	ŁaskŁódź Voivodeship, Poland	68	74	+3.1 µg/m³+17%
37	Santa MonicaCalifornia, United States	52	58	+3.1 µg/m³+32%
38	YaeHiroshima, Japan	38	52	+3.1 µg/m³+46%
39	VientianeVientiane Prefecture, Laos	80	86	+3.1 µg/m³+12%
40	SantyokuGangwon-do, South Korea	56	62	+3.0 µg/m³+25%
41	BeppuOita, Japan	51	57	+3.0 µg/m³+32%
42	FriedrichshafenBaden-Wurttemberg, Germany	46	55	+3.0 µg/m³+37%
43	SekimachiGifu, Japan	46	55	+3.0 µg/m³+37%
44	KaliszGreater Poland, Poland	68	74	+2.9 µg/m³+16%
45	Prince AlbertSaskatchewan, Canada	55	60	+2.9 µg/m³+26%
46	YeongamJeollanam-do, South Korea	52	58	+2.9 µg/m³+30%
47	The HagueSouth Holland, The Netherlands	39	53	+2.9 µg/m³+41%
48	Des MoinesIowa, United States	33	49	+2.9 µg/m³+48%
49	ShingūWakayama, Japan	31	47	+2.9 µg/m³+53%
50	CallaoPeru	72	77	+2.9 µg/m³+14%

The 50 biggest falls

#	City	2024	2025	Change
1	Santa MaríaLima region, Peru	161	124	−24.1 µg/m³−35%
2	LahorePunjab, Pakistan	235	218	−17.4 µg/m³−11%
3	KolkataWest Bengal, India	163	152	−15.5 µg/m³−21%
4	Port IsabelTexas, United States	75	60	−8.1 µg/m³−37%
5	PeshawarKhyber Pakhtunkhwa, Pakistan	189	184	−8.1 µg/m³−7%
6	JakartaIndonesia	115	96	−7.8 µg/m³−19%
7	KathmanduBagmati Province, Nepal	152	135	−7.7 µg/m³−14%
8	HualpénBiobio, Chile	134	116	−7.0 µg/m³−14%
9	DebrecenHajdú-Bihar, Hungary	82	69	−6.8 µg/m³−26%
10	Banja LukaSrpska, Bosnia and Herzegovina	105	92	−6.2 µg/m³−17%
11	CelayaGuanajuato, Mexico	79	67	−6.2 µg/m³−26%
12	RacibórzSilesia, Poland	71	59	−6.1 µg/m³−31%
13	La UniónLos Ríos Region, Chile	106	93	−5.9 µg/m³−16%
14	DelhiIndia	184	179	−5.8 µg/m³−6%
15	SarajevoFederation of B&H, Bosnia and Herzegovina	107	94	−5.8 µg/m³−15%
16	MeridianIdaho, United States	54	31	−5.1 µg/m³−48%
17	Puerto MonttLos Lagos Region, Chile	99	90	−5.0 µg/m³−14%
18	MumbaiMaharashtra, India	122	111	−4.8 µg/m³−11%
19	MissionTexas, United States	61	53	−4.6 µg/m³−32%
20	ShreveportLouisiana, United States	54	34	−4.4 µg/m³−42%
21	SokchoGangwon-do, South Korea	62	54	−4.2 µg/m³−28%
22	Kędzierzyn-KoźleOpole Voivodeship, Poland	67	60	−4.2 µg/m³−23%
23	SheridanWyoming, United States	49	26	−4.1 µg/m³−47%
24	Timberwood ParkTexas, United States	55	42	−3.9 µg/m³−34%
25	KatowiceSilesia, Poland	71	64	−3.8 µg/m³−19%
26	TalcahuanoBiobio, Chile	91	84	−3.7 µg/m³−12%
27	OsornoLos Lagos Region, Chile	126	117	−3.7 µg/m³−8%
28	HualquiBiobio, Chile	96	89	−3.7 µg/m³−11%
29	CoyhaiqueAysén, Chile	144	135	−3.7 µg/m³−7%
30	CuranilahueBiobio, Chile	105	96	−3.6 µg/m³−10%
31	BartlettTennessee, United States	55	44	−3.5 µg/m³−30%
32	ToméBiobio, Chile	83	77	−3.3 µg/m³−13%
33	Puerto AysénAysén, Chile	96	90	−3.3 µg/m³−10%
34	QuillotaValparaiso, Chile	85	79	−3.2 µg/m³−12%
35	OpoleOpole Voivodeship, Poland	68	62	−3.2 µg/m³−17%
36	CauquenesMaule Region, Chile	87	81	−3.2 µg/m³−11%
37	YeojuGyeonggi-do, South Korea	70	64	−3.0 µg/m³−16%
38	BendOregon, United States	47	31	−2.9 µg/m³−35%
39	BirminghamAlabama, United States	59	54	−2.9 µg/m³−22%
40	RedmondOregon, United States	42	26	−2.9 µg/m³−38%
41	CoronelBiobio, Chile	94	89	−2.9 µg/m³−9%
42	HyderabadTelangana, India	115	108	−2.9 µg/m³−7%
43	NampaIdaho, United States	52	39	−2.8 µg/m³−28%
44	BreukelenUtrecht, The Netherlands	55	47	−2.8 µg/m³−25%
45	MaarssenUtrecht, The Netherlands	55	47	−2.8 µg/m³−25%
46	KościerzynaPomerania, Poland	59	54	−2.8 µg/m³−21%
47	NyíregyházaSzabolcs-Szatmár-Bereg, Hungary	64	59	−2.8 µg/m³−18%
48	ChillánÑuble, Chile	96	91	−2.7 µg/m³−8%
49	East LakeFlorida, United States	48	33	−2.7 µg/m³−31%
50	HollisterCalifornia, United States	41	26	−2.6 µg/m³−36%

Means in US AQI over the days a city was measured in both years, the same calendar days each year; a city needs 55% of the days paired, and at least 30. The change is in µg/m³ and per cent. How we compare.

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

By country

Updated 2026-10-07 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.