SmogRank / Cleaner or dirtier

Cleaner or dirtier: 2024

1,108 measured cities have enough days in both years to compare 2024 with the same days of 2023: 286 got dirtier and 794 cleaner. Biggest rise first.

The 50 biggest rises

#	City	2023	2024	Change
1	PeshawarKhyber Pakhtunkhwa, Pakistan	164	178	+19.9 µg/m³+27%
2	LahorePunjab, Pakistan	208	221	+13.2 µg/m³+10%
3	KathmanduBagmati Province, Nepal	112	144	+12.8 µg/m³+32%
4	Port IsabelTexas, United States	55	73	+9.4 µg/m³+82%
5	IslamabadPakistan	139	154	+8.6 µg/m³+17%
6	AntananarivoAnalamanga, Madagascar	79	92	+7.1 µg/m³+29%
7	ChiguayanteBiobio, Chile	76	88	+6.9 µg/m³+31%
8	ValdiviaLos Ríos Region, Chile	87	99	+6.6 µg/m³+23%
9	Jurong WestSingapore	48	60	+5.4 µg/m³+63%
10	DelhiIndia	180	183	+5.3 µg/m³+5%
11	CoyhaiqueAysén, Chile	141	152	+5.1 µg/m³+10%
12	NacimientoBiobio, Chile	123	136	+5.1 µg/m³+11%
13	CuranilahueBiobio, Chile	96	107	+4.9 µg/m³+15%
14	Banja LukaSrpska, Bosnia and Herzegovina	90	99	+4.9 µg/m³+16%
15	La UniónLos Ríos Region, Chile	96	107	+4.8 µg/m³+15%
16	BeijingChina	106	117	+4.6 µg/m³+12%
17	MeridianIdaho, United States	36	55	+4.6 µg/m³+72%
18	HualquiBiobio, Chile	90	98	+4.5 µg/m³+15%
19	PoznańGreater Poland, Poland	59	67	+4.4 µg/m³+33%
20	Garden CityIdaho, United States	34	53	+4.3 µg/m³+70%
21	OsornoLos Lagos Region, Chile	127	137	+3.9 µg/m³+8%
22	CoronelBiobio, Chile	91	98	+3.8 µg/m³+13%
23	RengoO'Higgins Region, Chile	92	99	+3.6 µg/m³+12%
24	TalcahuanoBiobio, Chile	87	94	+3.5 µg/m³+12%
25	El PasoTexas, United States	42	55	+3.5 µg/m³+47%
26	NampaIdaho, United States	40	54	+3.5 µg/m³+49%
27	CuricóMaule Region, Chile	95	102	+3.3 µg/m³+10%
28	NogalesArizona, United States	43	54	+3.2 µg/m³+42%
29	Twin FallsIdaho, United States	29	46	+3.1 µg/m³+60%
30	KazincbarcikaBorsod-Abaúj-Zemplén, Hungary	61	67	+3.1 µg/m³+21%
31	TemucoAraucania, Chile	97	104	+3.0 µg/m³+9%
32	AlgiersAlgeria	63	69	+3.0 µg/m³+19%
33	BurbankCalifornia, United States	53	58	+3.0 µg/m³+30%
34	WoodlandsSingapore	48	56	+3.0 µg/m³+35%
35	FontanaCalifornia, United States	59	65	+3.0 µg/m³+22%
36	ConcepciónBiobio, Chile	76	81	+2.9 µg/m³+13%
37	Puerto AysénAysén, Chile	91	96	+2.8 µg/m³+9%
38	Jurupa ValleyCalifornia, United States	56	61	+2.7 µg/m³+23%
39	HollisterCalifornia, United States	26	41	+2.7 µg/m³+59%
40	MumbaiMaharashtra, India	110	116	+2.6 µg/m³+7%
41	EdinburgTexas, United States	52	57	+2.6 µg/m³+27%
42	Sham Shui PoSham Shui Po District, Hong Kong	59	63	+2.5 µg/m³+19%
43	LafayetteLouisiana, United States	42	53	+2.5 µg/m³+33%
44	TalcaMaule Region, Chile	83	87	+2.4 µg/m³+9%
45	KatowiceSilesia, Poland	66	71	+2.4 µg/m³+14%
46	PortervilleCalifornia, United States	53	57	+2.4 µg/m³+24%
47	Lake ElsinoreCalifornia, United States	38	51	+2.4 µg/m³+35%
48	PocatelloIdaho, United States	27	41	+2.4 µg/m³+49%
49	CauquenesMaule Region, Chile	84	88	+2.4 µg/m³+9%
50	Tai PoHong Kong	61	66	+2.4 µg/m³+17%

The 50 biggest falls

#	City	2023	2024	Change
1	PristinaKosovo	89	57	−16.9 µg/m³−57%
2	Grande PrairieAlberta, Canada	84	56	−14.9 µg/m³−56%
3	Tha BoNong Khai, Thailand	104	75	−14.9 µg/m³−40%
4	DushanbeTajikistan	156	135	−13.0 µg/m³−21%
5	Fort St. JohnBritish Columbia, Canada	71	45	−11.7 µg/m³−59%
6	BishkekKyrgyzstan	75	53	−11.7 µg/m³−53%
7	EdmontonAlberta, Canada	76	59	−9.0 µg/m³−40%
8	Fort McMurrayAlberta, Canada	79	62	−8.8 µg/m³−37%
9	SalorTashkent Region, Uzbekistan	114	94	−8.6 µg/m³−21%
10	Prince AlbertSaskatchewan, Canada	73	57	−8.4 µg/m³−40%
11	Rouyn-NorandaQuebec, Canada	57	25	−8.0 µg/m³−64%
12	KamloopsBritish Columbia, Canada	60	35	−7.7 µg/m³−55%
13	KolkataWest Bengal, India	157	151	−7.6 µg/m³−12%
14	QuesnelBritish Columbia, Canada	63	45	−7.5 µg/m³−48%
15	ReginaSaskatchewan, Canada	66	52	−7.5 µg/m³−44%
16	HyderabadTelangana, India	126	108	−7.2 µg/m³−16%
17	Fort SaskatchewanAlberta, Canada	71	57	−7.1 µg/m³−36%
18	SaskatoonSaskatchewan, Canada	69	56	−6.9 µg/m³−37%
19	JakartaIndonesia	124	107	−6.9 µg/m³−15%
20	EdsonAlberta, Canada	62	45	−6.8 µg/m³−46%
21	New HollandPennsylvania, United States	62	51	−6.0 µg/m³−39%
22	Grand CentreAlberta, Canada	67	56	−6.0 µg/m³−34%
23	Prince GeorgeBritish Columbia, Canada	61	49	−5.9 µg/m³−40%
24	YrekaCalifornia, United States	56	33	−5.8 µg/m³−50%
25	GreenOregon, United States	53	28	−5.4 µg/m³−52%
26	ChathamOntario, Canada	55	34	−5.1 µg/m³−45%
27	VernonBritish Columbia, Canada	56	38	−5.1 µg/m³−42%
28	BloomingtonIllinois, United States	55	36	−5.0 µg/m³−44%
29	Red DeerAlberta, Canada	61	52	−5.0 µg/m³−34%
30	KelownaBritish Columbia, Canada	52	28	−4.9 µg/m³−49%
31	Parry SoundOntario, Canada	53	29	−4.9 µg/m³−48%
32	BarabooWisconsin, United States	53	31	−4.8 µg/m³−46%
33	GreendaleWisconsin, United States	55	37	−4.8 µg/m³−42%
34	St. AlbertAlberta, Canada	61	52	−4.8 µg/m³−34%
35	West FargoNorth Dakota, United States	55	37	−4.8 µg/m³−42%
36	Grants PassOregon, United States	54	34	−4.7 µg/m³−44%
37	Iowa CityIowa, United States	57	42	−4.7 µg/m³−38%
38	ArrecifeCanary Islands, Spain	58	45	−4.7 µg/m³−37%
39	AppletonWisconsin, United States	54	33	−4.7 µg/m³−44%
40	CelayaGuanajuato, Mexico	86	77	−4.7 µg/m³−17%
41	North BayOntario, Canada	51	25	−4.6 µg/m³−51%
42	OttawaOntario, Canada	54	33	−4.6 µg/m³−44%
43	Lincoln ParkMichigan, United States	57	43	−4.5 µg/m³−37%
44	Williams LakeBritish Columbia, Canada	41	16	−4.5 µg/m³−62%
45	MolineIllinois, United States	55	37	−4.5 µg/m³−41%
46	TecumsehMichigan, United States	55	38	−4.5 µg/m³−39%
47	LondonOntario, Canada	55	39	−4.5 µg/m³−39%
48	AshlandOregon, United States	53	33	−4.4 µg/m³−42%
49	MarshallMinnesota, United States	55	38	−4.4 µg/m³−39%
50	WaukeshaWisconsin, United States	55	39	−4.4 µg/m³−38%

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.