Wicomico County, Maryland air quality history

Daily Air Quality Index summaries from EPA monitors in Wicomico, Maryland, 1984–2001.

85%

Good days in 1988

Median daily AQI, 1988

Days above 100 in 1988

192

Days with an AQI in 1988 (of 366)

In 1988, EPA reported a daily Air Quality Index (AQI) for Wicomico, Maryland on 192 days. 164 of those days (85%) were in the Good range, and the median daily AQI was 33. That median is lower than the typical monitored county in Maryland (median 42 across 10 counties), and lower than the typical monitored U.S. county (42). The main pollutant was ozone on 192 days.

EPA did not report an AQI for every day of 1988 here (192 of 366 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

The most recent year with data for this county is 2001; EPA's files for 2002–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1996, 1997, 1998, 1999, 2000, 2001…) are shown in the table but left out of comparisons and trend statements.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median daily AQI
90th-percentile daily AQI

Main pollutant by day, 1988

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

Pollutant	Days as main pollutant	Share of monitored days
Ozone	192	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Unhealthy	Very Unhealthy	Median AQI	90th pct.	Max AQI	Main pollutant
2001	58	58	0	0	0	0	11	19	34	PM10
2000	59	59	0	0	0	0	10	21	37	PM10
1999	56	56	0	0	0	0	10	23	31	PM10
1998	58	58	0	0	0	0	12	26	42	PM10
1997	60	60	0	0	0	0	14	29	45	PM10
1996	58	58	0	0	0	0	14	25	37	PM10
1995	60	60	0	0	0	0	15	24	32	PM10
1994	59	59	0	0	0	0	16	27	39	PM10
1993	61	61	0	0	0	0	18	34	41	PM10
1992	61	61	0	0	0	0	19	31	42	PM10
1991	57	56	1	0	0	0	20	38	52	PM10
1990	45	43	2	0	0	0	19	35	69	PM10
1988	192	164	20	8	0	0	33	80	133	Ozone
1987	196	170	25	1	0	0	37	54	105	Ozone
1986	303	213	50	27	11	2	38	119	218	Ozone
1985	266	146	61	45	13	1	48	126	212	Ozone
1984	84	82	2	0	0	0	28	41	84	Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

All monitored counties in Maryland

Source: U.S. EPA AirData, “Annual AQI by County” files for 1984–2001 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem