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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.