EnviroNearby

Beaufort County, South Carolina air quality history

Daily Air Quality Index summaries from EPA monitors in Beaufort, South Carolina, 1980–2007.

69%
Good days in 1993
43
Median daily AQI, 1993
18
Days above 100 in 1993
260
Days with an AQI in 1993 (of 365)

In 1993, EPA reported a daily Air Quality Index (AQI) for Beaufort, South Carolina on 260 days. 180 of those days (69%) were in the Good range, and the median daily AQI was 43. That median is higher than the typical monitored county in South Carolina (median 40 across 22 counties), and higher than the typical monitored U.S. county (38). The main pollutant was ozone on 260 days.

EPA did not report an AQI for every day of 1993 here (260 of 365 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 2007; EPA's files for 2008–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (2002, 2003, 2004, 2005, 2006, 2007…) 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.

Share of monitored days in each AQI category, by year0%25%50%75%100%1980: Good 86 of 93 days1980: Moderate 5 of 93 days1980: Unhealthy for Sensitive Groups 2 of 93 days19801981: Good 126 of 155 days1981: Moderate 22 of 155 days1981: Unhealthy for Sensitive Groups 6 of 155 days1981: Unhealthy 1 of 155 days1982: Good 64 of 76 days1982: Moderate 7 of 76 days1982: Unhealthy for Sensitive Groups 4 of 76 days1982: Unhealthy 1 of 76 days19821988: Good 200 of 257 days1988: Moderate 41 of 257 days1988: Unhealthy for Sensitive Groups 16 of 257 days1990: Good 61 of 160 days1990: Moderate 58 of 160 days1990: Unhealthy for Sensitive Groups 35 of 160 days1990: Unhealthy 6 of 160 days19901993: Good 180 of 260 days1993: Moderate 62 of 260 days1993: Unhealthy for Sensitive Groups 18 of 260 days1999: Good 25 of 75 days1999: Moderate 47 of 75 days1999: Unhealthy for Sensitive Groups 3 of 75 days19992000: Good 37 of 113 days2000: Moderate 76 of 113 days2001: Good 42 of 112 days2001: Moderate 70 of 112 days20012002: Good 54 of 118 days2002: Moderate 64 of 118 days2003: Good 59 of 119 days2003: Moderate 60 of 119 days20032004: Good 40 of 99 days2004: Moderate 58 of 99 days2004: Unhealthy for Sensitive Groups 1 of 99 days2005: Good 31 of 90 days2005: Moderate 57 of 90 days2005: Unhealthy for Sensitive Groups 2 of 90 days20052006: Good 53 of 116 days2006: Moderate 63 of 116 days2007: Good 48 of 95 days2007: Moderate 46 of 95 days2007: Unhealthy for Sensitive Groups 1 of 95 days2007
  • 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 and 90th-percentile daily AQI, by year0501001501980: 90th percentile AQI 501981: 90th percentile AQI 771982: 90th percentile AQI 901988: 90th percentile AQI 841990: 90th percentile AQI 1261993: 90th percentile AQI 871999: 90th percentile AQI 762000: 90th percentile AQI 732001: 90th percentile AQI 712002: 90th percentile AQI 642003: 90th percentile AQI 652004: 90th percentile AQI 722005: 90th percentile AQI 722006: 90th percentile AQI 712007: 90th percentile AQI 671980: Median AQI 321981: Median AQI 311982: Median AQI 321988: Median AQI 401990: Median AQI 641993: Median AQI 431999: Median AQI 552000: Median AQI 552001: Median AQI 542002: Median AQI 522003: Median AQI 512004: Median AQI 532005: Median AQI 552006: Median AQI 522007: Median AQI 5019801982199019992001200320052007
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 1993

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.

PollutantDays as main pollutantShare of monitored days
Ozone260100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
200795484610005067115PM2.5
200611653630000527182PM2.5
200590315720005572117PM2.5
200499405810005372101PM2.5
200311959600000516580PM2.5
200211854640000526483PM2.5
200111242700000547189PM2.5
200011337760000557394PM2.5
199975254730005576112PM2.5
199326018062180004387147Ozone
199016061583560064126174Ozone
198825720041160004084136Ozone
19827664741003290161Ozone
19811551262261003177151Ozone
19809386520003250119Ozone

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 South Carolina

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2007 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem