Get a monitor and contributor to air quality data in your city.
Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
Air quality in Maryland
Air quality index (AQI) and PM2.5 air pollution in Maryland
LIVE AQI CITY RANKING
Real-time Maryland
Most polluted city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Cambridge | 44 |
| 2 | Colmar Manor | 42 |
| 3 | Millington | 41 |
| 4 | Catonsville | 37 |
| 5 | Thurmont | 35 |
| 6 | Wheaton | 34 |
| 7 | Charlotte Hall | 33 |
| 8 | Dundalk | 33 |
| 9 | North Laurel | 33 |
| 10 | Princess Anne | 33 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
194 Contributors
See all
LIVE AQI CITY RANKING
Real-time Maryland
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Beltsville | 8 |
| 2 | Gaithersburg | 9 |
| 3 | Parole | 10 |
| 4 | Brandywine | 11 |
| 5 | Centreville | 11 |
| 6 | Hyattsville | 13 |
| 7 | Frostburg | 14 |
| 8 | Bethesda | 15 |
| 9 | Derwood | 15 |
| 10 | Edgewood | 15 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
Very unhealthy
Hazardous
News
The latest air quality news and resources.
Maryland air quality data attribution
194Contributors
- Maryland Department of the Environment
22 stations
- USA National Park Service
1 station
2 Government Contributors
Non-profit organization Contributor
- Ammar Rai
1 station
- Luis de Silva
1 station
- hillmead park
1 station
- TJ
1 station
- TFrey
1 station
- enilso
1 station
- harveytig
1 station
7 Individual Contributors
184 Anonymous contributors184 stations
184 Anonymous Contributors
Which is the most polluted city in Maryland?
- Cambridge 44
- Colmar Manor 42
- Millington 41
- Prince Frederick 39
- Catonsville 37
- Churchville 36
- Laurel 36
- Thurmont 35
- Upper Marlboro 35
- Wheaton 34
- Charlotte Hall 33
- Dundalk 33
- North Laurel 33
- Princess Anne 33
- Sykesville 33
- Ballenger Creek 32
- Keedysville 32
- Milford Mill 32
- Chillum 30
- Clarksburg 30
- Columbia 30
- Emmitsburg 30
- Frederick 30
- Glen Burnie 30
- Queen Anne 30
- Baltimore 29
- Hanover 29
- Kensington 29
- Mountain Lake Park 29
- Oakland 29
- Silver Spring 29
- Urbana 29
- Brunswick 28
- College Park 28
- Essex 28
- Greenbelt 28
- North Potomac 28
- Owings Mills 28
- Severn 28
- University Park 28
- Capitol Heights 27
- Forest Heights 27
- Green Haven 27
- Pikesville 27
- Pocomoke City 27
- Reisterstown 27
- Rockville 27
- Chevy Chase 26
- Cockeysville 26
- Fairmount Heights 26
- Landover 26
- Parkville 26
- Potomac 26
- Seat Pleasant 26
- Takoma Park 26
- Cheverly 25
- Mount Airy 25
- Oxon Hill 25
- Towson 25
- West Laurel 25
- Westernport 25
- Largo 24
- Westminster 24
- Damascus 23
- Elkton 22
- Ashton-Sandy Spring 21
- Chesapeake Beach 21
- Colesville 21
- Darnestown 21
- Eldersburg 21
- Garrison 21
- Hampstead 21
- Hampton 21
- Highland 21
- Hunt Valley 21
- Leisure World 21
- Lochearn 21
- Lutherville 21
- Lutherville-Timonium 21
- Mays Chapel 21
- Olney 21
- Perry Hall 21
- Randallstown 21
- Redland 21
- Rossmoor 21
- Timonium 21
- Travilah 21
- Woodlawn 21
- Aberdeen 20
- Algonquin 20
- Annapolis 20
- Aspen Hill 20
- Bel Air 20
- Bel Air North 20
- Bel Air South 20
- Burtonsville 20
- Cabin John 20
- California 20
- Carney 20
- Charlestown 20
- Cloverly 20
- Easton 20
- Ellicott City 20
- Fallston 20
- Fulton 20
- Garrett Park 20
- Glenmont 20
- Havre de Grace 20
- Ilchester 20
- Jarrettsville 20
- Joppatowne 20
- Kingsville 20
- Layhill 20
- Manchester 20
- Marlboro Meadows 20
- Montgomery Village 20
- North Bel Air 20
- North Bethesda 20
- North East 20
- North Kensington 20
- Perryville 20
- Pleasant Hills 20
- Rising Sun 20
- Riverside 20
- Saint Michaels 20
- Savage 20
- South Bel Air 20
- Spencerville 20
- Trappe 20
- White Marsh 20
- Aberdeen Proving Ground 19
- Arbutus 19
- Baltimore Highlands 19
- Bowleys Quarters 19
- Brookmont 19
- Calverton 19
- Chestertown 19
- Chevy Chase Village 19
- Clinton 19
- Elkridge 19
- Fairland 19
- Federalsburg 19
- Forest Glen 19
- Four Corners 19
- Friendship Village 19
- Germantown 19
- Hillandale 19
- Hurlock 19
- Kemp Mill 19
- Lansdowne 19
- Lothian 19
- Lusby 19
- Middle River 19
- Overlea 19
- Perryman 19
- Poolesville 19
- Riverdale Park 19
- Rosedale 19
- Rossville 19
- Scaggsville 19
- Somerset 19
- South Kensington 19
- West Elkridge 19
- White Oak 19
- Accokeek 18
- Adamstown 18
- Adelphi 18
- Andrews AFB 18
- Arden on the Severn 18
- Arnold 18
- Baden 18
- Bartonsville 18
- Berwyn Heights 18
- Bladensburg 18
- Boonsboro 18
- Bowie 18
- Braddock Heights 18
- Brentwood 18
- Brock Hall 18
- Brooklyn Park 18
- Buckeystown 18
- Camp Springs 18
- Cape Saint Claire 18
- Cavetown 18
- Clover Hill 18
- Coral Hills 18
- Cottage City 18
- Crofton 18
- Croom 18
- Crownsville 18
- Davidsonville 18
- Deale 18
- District Heights 18
- Dunkirk 18
- Dunkirk Town Center 18
- East Riverdale 18
- Edgemere 18
- Edgewater 18
- Edmonston 18
- Fairwood 18
- Ferndale 18
- Forestville 18
- Fort George G Mead Junction 18
- Fort Meade 18
- Fort Washington 18
- Friendly 18
- Gambrills 18
- Glassmanor 18
- Glenarden 18
- Goddard 18
- Grasonville 18
- Greater Upper Marlboro 18
- Green Valley 18
- Herald Harbor 18
- Highfield-Cascade 18
- Hillcrest Heights 18
- Hillsmere Shores 18
- Huntingtown 18
- Huntingtown Town Center 18
- Jefferson 18
- Jessup 18
- Kettering 18
- Kingstown 18
- Lake Arbor 18
- Lake Shore 18
- Landover Hills 18
- Langley Park 18
- Lanham 18
- Lanham-Seabrook 18
- Linganore 18
- Linthicum 18
- Londontowne 18
- Long Beach 18
- Marlboro Village 18
- Marlow Heights 18
- Marlton 18
- Maryland City 18
- Mayo 18
- Mellwood 18
- Mitchellville 18
- Morningside 18
- Mount Rainier 18
- Myersville 18
- National Harbor 18
- Naval Academy 18
- New Carrollton 18
- New Windsor 18
- North Beach 18
- Odenton 18
- Owings 18
- Oxon Hill-Glassmanor 18
- Pasadena 18
- Peppermill Village 18
- Point of Rocks 18
- Pumphrey 18
- Queenland 18
- Ridgely 18
- Riva 18
- Riviera Beach 18
- Rock Hall 18
- Rosaryville 18
- Saint Mary 18
- Seabrook 18
- Selby-on-the-Bay 18
- Severna Park 18
- Shady Side 18
- Silver Hill 18
- Smithsburg 18
- South Gate 18
- South Laurel 18
- Spring Ridge 18
- Springdale 18
- Stevensville 18
- Suitland 18
- Suitland-Silver Hill 18
- Summerfield 18
- Taneytown 18
- Temple Hills 18
- Walker Mill 18
- Walkersville 18
- Westphalia 18
- Woodmore 18
- Woodsboro 18
- Bennsville 17
- Bryans Road 17
- Chesapeake Ranch Estates 17
- Cobb Island 17
- Denton 17
- Drum Point 17
- Glenn Dale 17
- Golden Beach 17
- Greensboro 17
- Hagerstown 17
- Hughesville 17
- Indian Head 17
- La Plata 17
- Lexington Park 17
- Mechanicsville 17
- Potomac Heights 17
- Robinwood 17
- Saint Charles 17
- Solomons 17
- St. Charles 17
- Waldorf 17
- Chester 16
- Saint James 16
- Bethesda 15
- Derwood 15
- Edgewood 15
- Halfway 15
- Leonardtown 15
- Paramount-Long Meadow 15
- Frostburg 14
- Fountainhead-Orchard Hills 13
- Hyattsville 13
- Lonaconing 13
- Brandywine 11
- Centreville 11
- Maugansville 10
- Parole 10
- Gaithersburg 9
- Williamsport 9
- Beltsville 8
- Cresaptown 8
- Bowling Green 7
- La Vale 7
- Potomac Park 7
- Cumberland 5
- Wilson-Conococheague 5
- Berlin 4
- Crisfield 4
- Fruitland 4
- Hancock 4
- Hebron 4
- Ocean City 4
- Ocean Pines 4
- Pittsville 4
- Salisbury 4
- Snow Hill 4
- West Ocean City 4
AQI US, Metric