What is the air quality trend in Baltimore?

Over the past 15 days, Baltimore had an average AQI of 61 based on station measurements. The worst day was 2026-07-17 with AQI 166.

How is Baltimore air quality measured?

Air quality in Baltimore is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Baltimore, United States

Name: Baltimore Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Baltimore, United States.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

335h

PM2.5 Station

335h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	54	31–75	15.0 µg/m³	22h	25
2026-07-20	68	51–81	20.3 µg/m³	24h	25
2026-07-19	62	36–90	18.0 µg/m³	24h	26
2026-07-18	131	59–157	50.2 µg/m³	24h	27
2026-07-17	166	58–223	97.6 µg/m³	24h	28
2026-07-16	62	51–159	17.6 µg/m³	24h	26
2026-07-15	51	32–83	12.9 µg/m³	24h	27
2026-07-14	40	32–52	9.6 µg/m³	24h	26
2026-07-13	38	29–49	9.0 µg/m³	24h	26
2026-07-12	42	29–52	10.2 µg/m³	24h	25
2026-07-11	43	29–51	10.4 µg/m³	24h	21
2026-07-10	43	26–63	10.9 µg/m³	24h	25
2026-07-09	35	26–42	8.4 µg/m³	24h	26
2026-07-08	40	25–52	9.5 µg/m³	24h	28
2026-07-07	54	54–54	13.4 µg/m³	1h	31

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