Duplin County, North Carolina air quality history

Daily Air Quality Index summaries from EPA monitors in Duplin, North Carolina, 1992–2015.

82%

Good days in 2015

Median daily AQI, 2015

Days above 100 in 2015

326

Days with an AQI in 2015 (of 365)

In 2015, EPA reported a daily Air Quality Index (AQI) for Duplin, North Carolina on 326 days. 267 of those days (82%) were in the Good range, and the median daily AQI was 34. That median is lower than the typical monitored county in North Carolina (median 43.5 across 42 counties), and lower than the typical monitored U.S. county (41). The main pollutant was fine particles (PM2.5) on 326 days. Across the years with fuller monitoring, the share of Good days fell: an average of 64% in 1992–1994 versus 58% in 2013–2015.

The most recent year with data for this county is 2015; EPA's files for 2016–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (2005, 2006, 2007, 2008, 2009, 2011…) 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, 2015

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
Fine particles (PM2.5)	326	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Unhealthy	Median AQI	90th pct.	Max AQI	Main pollutant
2015	326	267	59	0	0	34	55	70	PM2.5
2014	303	134	169	0	0	52	63	84	PM2.5
2013	348	168	180	0	0	51	62	84	PM2.5
2012	314	116	198	0	0	53	64	95	PM2.5
2011	119	65	53	1	0	45	64	112	PM2.5
2010	121	67	54	0	0	47	62	71	PM2.5
2009	116	83	33	0	0	39	61	71	PM2.5
2008	109	51	58	0	0	52	65	80	PM2.5
2007	116	56	60	0	0	51	67	91	PM2.5
2006	116	47	69	0	0	53	71	90	PM2.5
2005	118	48	70	0	0	52	70	93	PM2.5
2004	113	41	72	0	0	55	69	99	PM2.5
2003	259	162	92	5	0	43	68	122	Ozone
2002	261	121	116	21	3	52	93	174	Ozone
2001	262	123	118	21	0	51	93	133	Ozone
2000	261	123	122	15	1	53	90	164	Ozone
1999	256	124	99	27	6	52	105	166	Ozone
1998	212	87	75	40	10	61	133	192	Ozone
1997	213	163	39	10	1	42	74	159	Ozone
1996	206	155	45	6	0	42	77	126	Ozone
1995	206	156	49	1	0	38	77	112	Ozone
1994	212	154	47	10	1	42	84	161	Ozone
1993	208	109	77	20	2	50	112	161	Ozone
1992	209	139	52	15	3	44	97	161	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.

Counties in North Carolina with a similar median AQI in 2015

All monitored counties in North Carolina

Source: U.S. EPA AirData, “Annual AQI by County” files for 1992–2015 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem