| United States |
| 25 | | | Ciencia ciudadana por la Calidad del Aire 50db59 |
| 8 | | | Ciencia ciudadana por la Calidad del Aire 27a3fd |
| 9 | | | Washington State Department of Ecology 53 033 0047 |
| 1 | Brewster: South 3rd Avenue, Brewster, Okanogan County, Washington, 98812, USA | | Washington State Department of Ecology 53 047 9990 |
| 8 | Burbank-Maple St: West Maple Street, Burbank, Walla Walla County, Washington, 99323, USA | | Washington State Department of Ecology 53 071 0006 |
| 3 | Cashmere: Foster Street, Cashmere, Chelan County, Washington, 98815, USA | | Washington State Department of Ecology aqs396 |
| 7 | Cathlamet: Cathlamet, Wahkiakum County, Washington, 98612, USA | | Washington State Department of Ecology 53 069 9990 |
| 6 | Cle Elum: Cle Elum, Kittitas County, Washington, 98922, USA | | Washington State Department of Ecology 53 037 0180 |
| 6 | Davenport: Logan Street, Davenport, Lincoln County, Washington, 99122, USA | | Washington State Department of Ecology 53 043 9990 |
| 3 | Des Moines-S 240th St: Bldg 8 Student Union, 2400, South 240th Street, Des Moines, King County, Washington, 98198, USA | | Washington State Department of Ecology aqs468 |
| 3 | | | Washington State Department of Ecology 53 007 9989 |
| 2 | Ellensburg-Discovery Hall: Central Washington University, 400, East University Way, Ellensburg, Kittitas County, Washington, 98926, USA | | Washington State Department of Ecology 53 037 9999 |
| 3 | | | Washington State Department of Ecology 53 037 9998 |
| 3 | | | Washington State Department of Ecology 53 037 9997 |
| 0 | Entiat: Kinzel Street, Entiat, Chelan County, Washington, 98822, USA | | Washington State Department of Ecology 53 007 9992 |
| 9 | Enumclaw-Mud Mtn.: Mud Mountain Road Southeast, Enumclaw, King County, Washington, 98022, USA | | Washington State Department of Ecology 53 033 0023 |
| 6 | Everett-12th St: 12th Street, Everett, Snohomish County, Washington, 98201, USA | | Washington State Department of Ecology aqs492 |
| 24 | | | Washington State Department of Ecology 53 061 0022 |
| 6 | | | Washington State Department of Ecology aqs466 |
| 6 | | | Washington State Department of Ecology aqs497 |
| 9 | | | Washington State Department of Ecology 53 005 9999 |
| 1 | | | Washington State Department of Ecology aqs469 |
| 6 | George: Washington Way North, Quincy, Grant County, Washington, 98824, USA | | Washington State Department of Ecology 53 025 9990 |
| 7 | | | Washington State Department of Ecology 53 039 9991 |
| 8 | | | AirNet - aiqcn.org - waqi.info 100363 |
| 41 | | | Wisconsin Department Of Natural Resources 55 053 2002 |
| 47 | | | Wisconsin Department Of Natural Resources 55 081 2001 |
| 15 | | | AirNet - aiqcn.org - waqi.info 100146 |
| 15 | Ilwaco: Brumbach Street, Ilwaco, Pacific County, Washington, 98624, USA | | Washington State Department of Ecology aqs501 |
| 3 | | | Washington State Department of Ecology 53 033 0010 |
| 10 | Kelso: Old Pacific Highway South, Kelso, Cowlitz County, Washington, 98626, USA | | Washington State Department of Ecology aqs494 |
| 6 | | | Washington State Department of Ecology 53 005 0003 |
| 13 | | | Wisconsin Department Of Natural Resources 55 059 0025 |
| 32 | | | Wisconsin Department Of Natural Resources 55 073 0012 |
| 2 | | | Washington State Department of Ecology 53 025 9999 |
| 17 | Mossyrock: Mossyrock Police, 231, East State Street, Mossyrock, Lewis County, Washington, 98564, USA | | Washington State Department of Ecology aqs498 |
| 3 | | | Washington State Department of Ecology 53 077 9998 |
| 16 | | | Washington State Department of Ecology 53 053 0012 |
| 17 | Newport-Calispel: West 1st Street, Newport, Pend Oreille County, Washington, 99156, USA | | Washington State Department of Ecology 53 051 0008 |
| 3 | Padilla Bay: Padilla Bay National Estuarine Research Reserve, Marihugh Road, Bay View, Skagit County, Washington, 98273, USA | | Washington State Department of Ecology 53 057 9990 |
| 3 | | | Washington State Department of Ecology 53 005 0004 |
| 4 | Puyallup-Pioneer Way E: Spinning Elementary School, 1306, East Pioneer, Puyallup, Pierce County, Washington, 98372, USA | | Washington State Department of Ecology 53 053 9999 |
| 11 | Republic: North Clark Avenue, Republic, Ferry County, Washington, 99166, USA | | Washington State Department of Ecology 53 019 9990 |
| 4 | Royal City: Royal High School, Road 12 Southwest, Royal Camp, Grant County, Washington, 99357, USA | | Washington State Department of Ecology 53 025 9991 |
| -1 | SeaTac-Sunset Park: 18th Avenue South, Foster, Burien, King County, Washington, 98168, USA | | Washington State Department of Ecology aqs491 |
| 5 | Seattle-16th Ave S: 16th Avenue South, Beacon Hill, Seattle, King County, Washington, 98144, USA | | Washington State Department of Ecology 53 033 9987 |
| 5 | Seattle-23rd Ave SW: 23rd Avenue SW, North Delridge, Seattle, King County, Washington, 98106, USA | | Washington State Department of Ecology 53 033 9993 |
| 6 | Seattle-5th Ave S: 5th Avenue South, Georgetown, Seattle, King County, Washington, 98108, USA | | Washington State Department of Ecology aqs503 |
| 2 | | | Washington State Department of Ecology 53 033 9989 |
| 3 | Seattle-Linden Ave N: Linden Avenue North, Bitter Lake, Seattle, King County, Washington, 98133, USA | | Washington State Department of Ecology 53 033 9985 |
| 4 | Seattle-NE 127th St: NE 127th Street, Olympic Hills, Seattle, King County, Washington, 98125, USA | | Washington State Department of Ecology 53 033 9988 |
| 3 | | | Washington State Department of Ecology 53 033 9984 |
| 12 | | | Washington State Department of Ecology 53 025 0003 |
| 9 | | | Washington State Department of Ecology 53 063 9992 |
| 5 | | | Washington State Department of Ecology 53 063 9993 |
| 5 | | | Washington State Department of Ecology 53 063 9994 |
| 6 | Spokane-E Garland Ave: John A Shaw Middle School, North Lacey Street, Bemiss, Hillyard, Spokane, Spokane County, Washington, 99207, USA | | Washington State Department of Ecology 53 063 9987 |
| 9 | Spokane-E Joseph Ave: Garry Junior High School, East Central Avenue, Whitman, Hillyard, Spokane, Spokane County, Washington, 99208, USA | | Washington State Department of Ecology 53 063 9989 |
| 18 | | | Washington State Department of Ecology 53 063 0054 |
| 6 | | | Washington State Department of Ecology 53 063 9990 |
| 38 | Spokane-E Thurston Ave: Hamblen Elementary School, South Napa Street, Spokane, Spokane County, Washington, 99203, USA | | Washington State Department of Ecology 53 063 9985 |
| 5 | Spokane-Greenbluff: E Green Bluff Road, Green Bluff, Spokane County, Washington, 99005, USA | | Washington State Department of Ecology 53 063 0046 |
| 6 | | | Washington State Department of Ecology 53 063 9986 |
| 7 | | | Washington State Department of Ecology 53 063 9988 |
| 5 | | | Washington State Department of Ecology 53 063 9991 |
| 0 | Starcross: Vestavia Hills, Jefferson County, Alabama, 35216, USA | | AirNet - aiqcn.org - waqi.info 100030 |
| 15 | Stevenson: Stevenson, Skamania County, Washington, 98648, USA | | Washington State Department of Ecology 53 059 9990 |
| 3 | Tacoma-S Adams St: Oakland Alternative High School, South 34th Street, Oakland Madrona, Tacoma, Pierce County, Washington, 98409, USA | | Washington State Department of Ecology aqs467 |
| 1 | Tonasket: Tonasket High School / Middle School, South Joseph Avenue, Tonasket, Okanogan County, Washington, 98855, USA | | Washington State Department of Ecology aqs465 |
| 13 | | | Washington State Department of Ecology aqs58 |
| 3 | | | Washington State Department of Ecology aqs490 |
| 14 | | | Washington State Department of Ecology 53 011 0011 |
| 23 | | | Washington State Department of Ecology aqs502 |
| 2 | Wenatchee-Methow St: Lincoln Elementary School, Lincoln Street, Wenatchee, Chelan County, Washington, 98801, USA | | Washington State Department of Ecology 53 017 9999 |
| 15 | White Salmon-N Main Ave: Hulan A. Whitson Elementary School, Northwest Academy Street, White Salmon, Klickitat County, Washington, 98672, USA | | Washington State Department of Ecology 53 039 9990 |
| 8 | | | Washington State Department of Ecology aqs500 |
| 19 | : Reno County, Kansas, USA | | Citizen Science project sensor.community 58460 |
| 21 | | | Northside Fort Worth Air 85594 |
| 1 | 148th Place SE: 148th Place SE, Renton, King County, Washington, 98059, USA | | Citizen Science project sensor.community 97516 |
| 14 | 19th Street: 19th Street, Windsor Terrace, Brooklyn, New York, Kings County, New York, 11218, USA | | Citizen Science project sensor.community 96399 |