EnviroNearby

St. Bernard Parish, Louisiana air quality history

Daily Air Quality Index summaries from EPA monitors in St. Bernard, Louisiana, 1981–2025.

73%
Good days in 2025
44
Median daily AQI, 2025
0
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for St. Bernard, Louisiana on 365 days. 266 of those days (73%) were in the Good range, and the median daily AQI was 44. That median is about the same as the typical monitored county in Louisiana (median 42 across 21 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 201 days. Across the years with fuller monitoring, the share of Good days fell: an average of 84% in 1981–1983 versus 60% in 2023–2025.

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%1981: Good 212 of 269 days1981: Moderate 46 of 269 days1981: Unhealthy for Sensitive Groups 9 of 269 days1981: Unhealthy 2 of 269 days19811982: Good 258 of 288 days1982: Moderate 22 of 288 days1982: Unhealthy for Sensitive Groups 7 of 288 days1982: Very Unhealthy 1 of 288 days1983: Good 263 of 319 days1983: Moderate 42 of 319 days1983: Unhealthy for Sensitive Groups 13 of 319 days1983: Unhealthy 1 of 319 days1984: Good 272 of 339 days1984: Moderate 42 of 339 days1984: Unhealthy for Sensitive Groups 19 of 339 days1984: Unhealthy 6 of 339 days1985: Good 283 of 356 days1985: Moderate 47 of 356 days1985: Unhealthy for Sensitive Groups 18 of 356 days1985: Unhealthy 7 of 356 days1985: Very Unhealthy 1 of 356 days1986: Good 297 of 343 days1986: Moderate 35 of 343 days1986: Unhealthy for Sensitive Groups 8 of 343 days1986: Unhealthy 3 of 343 days19861987: Good 275 of 353 days1987: Moderate 62 of 353 days1987: Unhealthy for Sensitive Groups 13 of 353 days1987: Unhealthy 3 of 353 days1988: Good 283 of 353 days1988: Moderate 49 of 353 days1988: Unhealthy for Sensitive Groups 19 of 353 days1988: Unhealthy 2 of 353 days1989: Good 297 of 358 days1989: Moderate 53 of 358 days1989: Unhealthy for Sensitive Groups 8 of 358 days1990: Good 295 of 357 days1990: Moderate 50 of 357 days1990: Unhealthy for Sensitive Groups 10 of 357 days1990: Unhealthy 2 of 357 days1991: Good 312 of 350 days1991: Moderate 27 of 350 days1991: Unhealthy for Sensitive Groups 10 of 350 days1991: Unhealthy 1 of 350 days19911992: Good 285 of 353 days1992: Moderate 55 of 353 days1992: Unhealthy for Sensitive Groups 10 of 353 days1992: Unhealthy 3 of 353 days1993: Good 271 of 362 days1993: Moderate 72 of 362 days1993: Unhealthy for Sensitive Groups 16 of 362 days1993: Unhealthy 3 of 362 days1994: Good 271 of 346 days1994: Moderate 54 of 346 days1994: Unhealthy for Sensitive Groups 17 of 346 days1994: Unhealthy 3 of 346 days1994: Very Unhealthy 1 of 346 days1995: Good 270 of 352 days1995: Moderate 62 of 352 days1995: Unhealthy for Sensitive Groups 19 of 352 days1995: Unhealthy 1 of 352 days1996: Good 283 of 358 days1996: Moderate 59 of 358 days1996: Unhealthy for Sensitive Groups 12 of 358 days1996: Unhealthy 4 of 358 days19961997: Good 289 of 356 days1997: Moderate 57 of 356 days1997: Unhealthy for Sensitive Groups 10 of 356 days1998: Good 287 of 362 days1998: Moderate 53 of 362 days1998: Unhealthy for Sensitive Groups 18 of 362 days1998: Unhealthy 4 of 362 days1999: Good 249 of 353 days1999: Moderate 72 of 353 days1999: Unhealthy for Sensitive Groups 29 of 353 days1999: Unhealthy 3 of 353 days2000: Good 201 of 362 days2000: Moderate 134 of 362 days2000: Unhealthy for Sensitive Groups 23 of 362 days2000: Unhealthy 4 of 362 days2001: Good 249 of 359 days2001: Moderate 98 of 359 days2001: Unhealthy for Sensitive Groups 12 of 359 days20012002: Good 255 of 360 days2002: Moderate 95 of 360 days2002: Unhealthy for Sensitive Groups 9 of 360 days2002: Unhealthy 1 of 360 days2003: Good 262 of 362 days2003: Moderate 86 of 362 days2003: Unhealthy for Sensitive Groups 11 of 362 days2003: Unhealthy 3 of 362 days2004: Good 265 of 359 days2004: Moderate 85 of 359 days2004: Unhealthy for Sensitive Groups 8 of 359 days2004: Unhealthy 1 of 359 days2005: Good 151 of 274 days2005: Moderate 109 of 274 days2005: Unhealthy for Sensitive Groups 13 of 274 days2005: Unhealthy 1 of 274 days2006: Good 68 of 203 days2006: Moderate 128 of 203 days2006: Unhealthy for Sensitive Groups 7 of 203 days20062007: Good 127 of 360 days2007: Moderate 222 of 360 days2007: Unhealthy for Sensitive Groups 11 of 360 days2008: Good 113 of 347 days2008: Moderate 233 of 347 days2008: Unhealthy for Sensitive Groups 1 of 347 days2009: Good 126 of 365 days2009: Moderate 237 of 365 days2009: Unhealthy for Sensitive Groups 2 of 365 days2010: Good 82 of 365 days2010: Moderate 275 of 365 days2010: Unhealthy for Sensitive Groups 8 of 365 days2011: Good 96 of 362 days2011: Moderate 259 of 362 days2011: Unhealthy for Sensitive Groups 7 of 362 days20112012: Good 120 of 359 days2012: Moderate 238 of 359 days2012: Unhealthy for Sensitive Groups 1 of 359 days2013: Good 227 of 358 days2013: Moderate 130 of 358 days2013: Unhealthy for Sensitive Groups 1 of 358 days2014: Good 145 of 364 days2014: Moderate 214 of 364 days2014: Unhealthy for Sensitive Groups 5 of 364 days2015: Good 164 of 365 days2015: Moderate 201 of 365 days2016: Good 210 of 366 days2016: Moderate 154 of 366 days2016: Unhealthy for Sensitive Groups 2 of 366 days20162017: Good 259 of 365 days2017: Moderate 106 of 365 days2018: Good 188 of 365 days2018: Moderate 174 of 365 days2018: Unhealthy for Sensitive Groups 3 of 365 days2019: Good 159 of 365 days2019: Moderate 205 of 365 days2019: Unhealthy for Sensitive Groups 1 of 365 days2020: Good 229 of 357 days2020: Moderate 128 of 357 days2021: Good 206 of 359 days2021: Moderate 153 of 359 days20212022: Good 209 of 365 days2022: Moderate 155 of 365 days2022: Unhealthy for Sensitive Groups 1 of 365 days2023: Good 156 of 365 days2023: Moderate 207 of 365 days2023: Unhealthy for Sensitive Groups 2 of 365 days2024: Good 241 of 366 days2024: Moderate 123 of 366 days2024: Unhealthy for Sensitive Groups 2 of 366 days2025: Good 266 of 365 days2025: Moderate 99 of 365 days2025
  • 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 year0501001981: 90th percentile AQI 711982: 90th percentile AQI 511983: 90th percentile AQI 741984: 90th percentile AQI 871985: 90th percentile AQI 801986: 90th percentile AQI 611987: 90th percentile AQI 841988: 90th percentile AQI 771989: 90th percentile AQI 711990: 90th percentile AQI 741991: 90th percentile AQI 611992: 90th percentile AQI 741993: 90th percentile AQI 841994: 90th percentile AQI 771995: 90th percentile AQI 841996: 90th percentile AQI 741997: 90th percentile AQI 741998: 90th percentile AQI 841999: 90th percentile AQI 972000: 90th percentile AQI 972001: 90th percentile AQI 712002: 90th percentile AQI 672003: 90th percentile AQI 742004: 90th percentile AQI 662005: 90th percentile AQI 772006: 90th percentile AQI 802007: 90th percentile AQI 772008: 90th percentile AQI 672009: 90th percentile AQI 682010: 90th percentile AQI 772011: 90th percentile AQI 772012: 90th percentile AQI 772013: 90th percentile AQI 612014: 90th percentile AQI 692015: 90th percentile AQI 692016: 90th percentile AQI 592017: 90th percentile AQI 582018: 90th percentile AQI 662019: 90th percentile AQI 642020: 90th percentile AQI 582021: 90th percentile AQI 612022: 90th percentile AQI 612023: 90th percentile AQI 672024: 90th percentile AQI 612025: 90th percentile AQI 581981: Median AQI 351982: Median AQI 301983: Median AQI 341984: Median AQI 341985: Median AQI 341986: Median AQI 311987: Median AQI 341988: Median AQI 321989: Median AQI 311990: Median AQI 321991: Median AQI 311992: Median AQI 331993: Median AQI 401994: Median AQI 381995: Median AQI 371996: Median AQI 351997: Median AQI 351998: Median AQI 361999: Median AQI 402000: Median AQI 462001: Median AQI 442002: Median AQI 402003: Median AQI 412004: Median AQI 382005: Median AQI 482006: Median AQI 572007: Median AQI 552008: Median AQI 542009: Median AQI 552010: Median AQI 582011: Median AQI 582012: Median AQI 552013: Median AQI 452014: Median AQI 532015: Median AQI 522016: Median AQI 462017: Median AQI 432018: Median AQI 492019: Median AQI 522020: Median AQI 442021: Median AQI 472022: Median AQI 472023: Median AQI 522024: Median AQI 452025: Median AQI 441981198619911996200120062011201620212025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

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
Ozone20155%
Fine particles (PM2.5)16445%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025365266990000445893Ozone
202436624112320004561138Ozone
202336515620720005267119PM2.5
202236520915510004761108PM2.5
20213592061530000476180PM2.5
20203572291280000445886PM2.5
201936515920510005264112PM2.5
201836518817430004966112PM2.5
20173652591060000435899PM2.5
201636621015420004659115PM2.5
20153651642010000526994PM2.5
201436414521450005369112PM2.5
201335822713010004561115PM2.5
201235912023810005577119PM2.5
20113629625970005877143PM2.5
20103658227580005877140PM2.5
200936512623720005568133PM2.5
200834711323310005467101PM2.5
2007360127222110005577143PM2.5
20062036812870005780119PM2.5
2005274151109131004877159Ozone
20043592658581003866172Ozone
200336226286113004174195Ozone
20023602559591004067172Ozone
200135924998120004471147Ozone
2000362201134234004697164Ozone
199935324972293004097161Ozone
199836228753184003684195Ozone
199735628957100003574136Ozone
199635828359124003574159Ozone
199535227062191003784156Ozone
199434627154173103877203Ozone
199336227172163004084192Ozone
199235328555103003374174Ozone
199135031227101003161154Ozone
199035729550102003274159Ozone
19893582975380003171129Ozone
198835328349192003277164Ozone
198735327562133003484169Ozone
19863432973583003161174Ozone
198535628347187103480202Ozone
198433927242196003487177Ozone
198331926342131003474154Ozone
19822882582270103051204Ozone
19812692124692003571174Ozone

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 Louisiana with a similar median AQI in 2025

All monitored counties in Louisiana

Source: U.S. EPA AirData, “Annual AQI by County” files for 1981–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem