SmogRank / Countries / United States / California

Most polluted cities in California, United States

107 measured cities ranked by PM2.5, last 7 days. Worst: Calexico at 29.6 µg/m³, #80 in the world.

#	City	µg/m³
1	Calexico California	29.6
2	Richmond California	14.5
3	Jurupa Valley California	14.3
4	Clovis California	13.7
5	Riverside California	13.4
6	Los Angeles California	13.0
7	Hanford California	12.6
8	Fontana California	12.5
9	Fresno California	12.1
10	Whittier California	12.1
11	Hawthorne low-cost sensorsCalifornia	11.3
12	San Diego California	11.3
13	Compton California	11.1
14	Corcoran California	11.0
15	Chula Vista California	10.9
16	Inglewood low-cost sensorsCalifornia	10.8
17	Carson low-cost sensorsCalifornia	10.7
18	Porterville California	10.5
19	Tulare low-cost sensorsCalifornia	10.5
20	Santa Monica low-cost sensorsCalifornia	10.4
21	Glendora California	10.3
22	Bakersfield California	10.1
23	El Cajon California	10.0
24	Mission Viejo California	10.0
25	Madera California	9.9
26	Oceanside California	9.9
27	Pasadena low-cost sensorsCalifornia	9.8
28	Burbank California	9.6
29	Merced California	9.6
30	Torrance low-cost sensorsCalifornia	9.6
31	Anaheim California	9.5
32	San Jose California	9.5
33	Lomita low-cost sensorsCalifornia	9.3
34	Poway California	9.1
35	Lake Elsinore California	9.0
36	San Leandro California	9.0
37	Thousand Oaks California	9.0
38	Agoura low-cost sensorsCalifornia	8.8
39	Long Beach California	8.8
40	Turlock California	8.7
41	Manteca California	8.5
42	Huntington Beach low-cost sensorsCalifornia	8.4
43	Salinas California	8.3
44	Vallejo California	8.3
45	Yuba City California	8.3
46	Arroyo Grande California	8.2
47	San Francisco California	8.2
48	Redwood City California	8.1
49	Santa Cruz California	8.1
50	Arden-Arcade California	7.9
51	Elk Grove low-cost sensorsCalifornia	7.7
52	Livermore California	7.7
53	Oakland California	7.7
54	Brawley California	7.6
55	Orcutt California	7.6
56	Santa Clarita California	7.6
57	Stockton California	7.6
58	Prunedale low-cost sensorsCalifornia	7.5
59	Gilroy California	7.1
60	Concord California	6.9
61	Temecula California	6.9
62	Galt California	6.8
63	South Lake Tahoe California	6.8
64	Davis California	6.7
65	Delano low-cost sensorsCalifornia	6.7
66	Sacramento California	6.7
67	San Rafael California	6.5
68	Simi Valley California	6.5
69	South San Francisco low-cost sensorsCalifornia	6.5
70	Banning California	6.4
71	Nipomo California	6.4
72	Roseville California	6.4
73	Victorville California	6.4
74	Florin low-cost sensorsCalifornia	6.3
75	Seaside low-cost sensorsCalifornia	6.3
76	Fillmore California	6.2
77	Live Oak low-cost sensorsCalifornia	6.1
78	Oxnard California	6.1
79	Watsonville low-cost sensorsCalifornia	6.1
80	La Crescenta-Montrose low-cost sensorsCalifornia	6.1
81	Lincoln California	6.0
82	Hollister California	5.8
83	Los Banos low-cost sensorsCalifornia	5.7
84	Ukiah California	5.7
85	El Centro California	5.6
86	Tracy California	5.6
87	Redding California	5.3
88	Atascadero California	5.2
89	Goleta low-cost sensorsCalifornia	5.2
90	Chico California	5.1
91	Santa Rosa California	5.0
92	Windsor low-cost sensorsCalifornia	5.0
93	Paradise California	4.9
94	Truckee California	4.9
95	Encinitas low-cost sensorsCalifornia	4.8
96	Indio California	4.8
97	Ridgecrest California	4.8
98	Palo Alto low-cost sensorsCalifornia	4.6
99	Lancaster California	4.5
100	Folsom California	4.2
101	Lompoc California	4.0
102	Fremont low-cost sensorsCalifornia	3.7
103	Vacaville California	3.2
104	Sunnyvale low-cost sensorsCalifornia	3.0
105	Ceres low-cost sensorsCalifornia	2.8
106	Mountain View low-cost sensorsCalifornia	2.7
107	San Mateo low-cost sensorsCalifornia	1.6

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

Updated 2026-10-01 04:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.