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Worst Air Quality ZIP Codes in Maryland

Top 50 worst air quality zip codes in america in Maryland. ZIP-level data from EPA Air Quality Index.

Top 50

#	ZIP Code	City / Suburb	Median AQI
1	21901	North East	44
2	21902	—	44
3	21903	Perryville	44
4	21904	Port Deposit	44
5	21911	Rising Sun	44
6	21912	Cecilton	44
7	21913	Cecilton	44
8	21914	Charlestown	44
9	21915	Chesapeake City	44
10	21917	—	44
11	21918	—	44
12	21919	—	44
13	21920	—	44
14	21921	Elkton	44
15	21930	—	44
16	21701	Frederick	43
17	21702	Frederick	43
18	21703	Ballenger Creek	43
19	21704	Urbana	43
20	21705	Frederick	43
21	21710	Adamstown	43
22	21714	Braddock Heights	43
23	21716	Brunswick	43
24	21717	Buckeystown	43
25	21718	Burkittsville	43
26	21727	Emmitsburg	43
27	21754	Urbana	43
28	21755	Jefferson	43
29	21758	Garretts Mill	43
30	21762	Libertytown	43
31	21769	Middletown	43
32	21770	Green Valley	43
33	21771	Green Valley	43
34	21773	Myersville	43
35	21774	Linganore	43
36	21777	Point of Rocks	43
37	21778	—	43
38	21780	Sabillasville	43
39	21788	Thurmont	43
40	21790	Point of Rocks	43
41	21791	Union Bridge	43
42	21793	Walkersville	43
43	21798	Woodsboro	43
44	21001	Aberdeen	42
45	21005	Aberdeen Proving Ground	42
46	21009	Bel Air South	42
47	21010	Edgewood	42
48	21013	Fallston	42
49	21014	Bel Air North	42
50	21015	Bel Air South	42

Methodology

This ranking is based on EPA Air Quality Index data, scoped to Maryland ZIP codes. Up to 50 ZIP codes are listed, ordered by median aqi. Data is refreshed periodically. See our methodology page for full details on data sources and update frequency.

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