EnviroNearby

East Baton Rouge Parish, Louisiana air quality history

Daily Air Quality Index summaries from EPA monitors in East Baton Rouge, Louisiana, 1980–2025.

50%
Good days in 2025
51
Median daily AQI, 2025
1
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 East Baton Rouge, Louisiana on 365 days. 181 of those days (50%) were in the Good range, and the median daily AQI was 51. That median is higher than 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 fine particles (PM2.5) on 258 days. Across the years with fuller monitoring, the share of Good days fell: an average of 71% in 1980–1982 versus 46% 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%1980: Good 246 of 336 days1980: Moderate 50 of 336 days1980: Unhealthy for Sensitive Groups 23 of 336 days1980: Unhealthy 11 of 336 days1980: Very Unhealthy 6 of 336 days19801981: Good 230 of 365 days1981: Moderate 68 of 365 days1981: Unhealthy for Sensitive Groups 35 of 365 days1981: Unhealthy 22 of 365 days1981: Very Unhealthy 10 of 365 days1982: Good 275 of 365 days1982: Moderate 57 of 365 days1982: Unhealthy for Sensitive Groups 18 of 365 days1982: Unhealthy 9 of 365 days1982: Very Unhealthy 6 of 365 days1983: Good 252 of 365 days1983: Moderate 82 of 365 days1983: Unhealthy for Sensitive Groups 24 of 365 days1983: Unhealthy 4 of 365 days1983: Very Unhealthy 3 of 365 days1984: Good 221 of 366 days1984: Moderate 113 of 366 days1984: Unhealthy for Sensitive Groups 19 of 366 days1984: Unhealthy 9 of 366 days1984: Very Unhealthy 4 of 366 days1985: Good 187 of 365 days1985: Moderate 130 of 365 days1985: Unhealthy for Sensitive Groups 31 of 365 days1985: Unhealthy 15 of 365 days1985: Very Unhealthy 2 of 365 days19851986: Good 199 of 365 days1986: Moderate 110 of 365 days1986: Unhealthy for Sensitive Groups 38 of 365 days1986: Unhealthy 18 of 365 days1987: Good 186 of 365 days1987: Moderate 128 of 365 days1987: Unhealthy for Sensitive Groups 36 of 365 days1987: Unhealthy 13 of 365 days1987: Very Unhealthy 2 of 365 days1988: Good 225 of 366 days1988: Moderate 90 of 366 days1988: Unhealthy for Sensitive Groups 34 of 366 days1988: Unhealthy 13 of 366 days1988: Very Unhealthy 4 of 366 days1989: Good 253 of 365 days1989: Moderate 74 of 365 days1989: Unhealthy for Sensitive Groups 27 of 365 days1989: Unhealthy 8 of 365 days1989: Very Unhealthy 3 of 365 days1990: Good 226 of 365 days1990: Moderate 90 of 365 days1990: Unhealthy for Sensitive Groups 27 of 365 days1990: Unhealthy 16 of 365 days1990: Very Unhealthy 6 of 365 days19901991: Good 245 of 365 days1991: Moderate 89 of 365 days1991: Unhealthy for Sensitive Groups 19 of 365 days1991: Unhealthy 10 of 365 days1991: Very Unhealthy 2 of 365 days1992: Good 234 of 366 days1992: Moderate 98 of 366 days1992: Unhealthy for Sensitive Groups 26 of 366 days1992: Unhealthy 7 of 366 days1992: Very Unhealthy 1 of 366 days1993: Good 240 of 365 days1993: Moderate 88 of 365 days1993: Unhealthy for Sensitive Groups 28 of 365 days1993: Unhealthy 7 of 365 days1993: Very Unhealthy 2 of 365 days1994: Good 254 of 365 days1994: Moderate 83 of 365 days1994: Unhealthy for Sensitive Groups 21 of 365 days1994: Unhealthy 6 of 365 days1994: Very Unhealthy 1 of 365 days1995: Good 245 of 365 days1995: Moderate 67 of 365 days1995: Unhealthy for Sensitive Groups 37 of 365 days1995: Unhealthy 12 of 365 days1995: Very Unhealthy 4 of 365 days19951996: Good 249 of 366 days1996: Moderate 82 of 366 days1996: Unhealthy for Sensitive Groups 26 of 366 days1996: Unhealthy 8 of 366 days1996: Very Unhealthy 1 of 366 days1997: Good 243 of 365 days1997: Moderate 84 of 365 days1997: Unhealthy for Sensitive Groups 26 of 365 days1997: Unhealthy 11 of 365 days1997: Very Unhealthy 1 of 365 days1998: Good 230 of 365 days1998: Moderate 92 of 365 days1998: Unhealthy for Sensitive Groups 27 of 365 days1998: Unhealthy 10 of 365 days1998: Very Unhealthy 6 of 365 days1999: Good 47 of 365 days1999: Moderate 261 of 365 days1999: Unhealthy for Sensitive Groups 38 of 365 days1999: Unhealthy 16 of 365 days1999: Very Unhealthy 3 of 365 days2000: Good 54 of 366 days2000: Moderate 247 of 366 days2000: Unhealthy for Sensitive Groups 41 of 366 days2000: Unhealthy 20 of 366 days2000: Very Unhealthy 4 of 366 days20002001: Good 74 of 365 days2001: Moderate 259 of 365 days2001: Unhealthy for Sensitive Groups 29 of 365 days2001: Unhealthy 3 of 365 days2002: Good 67 of 365 days2002: Moderate 278 of 365 days2002: Unhealthy for Sensitive Groups 16 of 365 days2002: Unhealthy 3 of 365 days2002: Very Unhealthy 1 of 365 days2003: Good 79 of 365 days2003: Moderate 252 of 365 days2003: Unhealthy for Sensitive Groups 19 of 365 days2003: Unhealthy 12 of 365 days2003: Very Unhealthy 3 of 365 days2004: Good 108 of 366 days2004: Moderate 223 of 366 days2004: Unhealthy for Sensitive Groups 26 of 366 days2004: Unhealthy 8 of 366 days2004: Very Unhealthy 1 of 366 days2005: Good 65 of 365 days2005: Moderate 253 of 365 days2005: Unhealthy for Sensitive Groups 35 of 365 days2005: Unhealthy 12 of 365 days20052006: Good 59 of 365 days2006: Moderate 265 of 365 days2006: Unhealthy for Sensitive Groups 33 of 365 days2006: Unhealthy 8 of 365 days2007: Good 91 of 365 days2007: Moderate 247 of 365 days2007: Unhealthy for Sensitive Groups 24 of 365 days2007: Unhealthy 2 of 365 days2007: Very Unhealthy 1 of 365 days2008: Good 114 of 366 days2008: Moderate 236 of 366 days2008: Unhealthy for Sensitive Groups 16 of 366 days2009: Good 152 of 365 days2009: Moderate 197 of 365 days2009: Unhealthy for Sensitive Groups 13 of 365 days2009: Unhealthy 3 of 365 days2010: Good 91 of 365 days2010: Moderate 257 of 365 days2010: Unhealthy for Sensitive Groups 16 of 365 days2010: Unhealthy 1 of 365 days20102011: Good 84 of 365 days2011: Moderate 259 of 365 days2011: Unhealthy for Sensitive Groups 18 of 365 days2011: Unhealthy 4 of 365 days2012: Good 131 of 363 days2012: Moderate 221 of 363 days2012: Unhealthy for Sensitive Groups 9 of 363 days2012: Unhealthy 2 of 363 days2013: Good 150 of 365 days2013: Moderate 210 of 365 days2013: Unhealthy for Sensitive Groups 3 of 365 days2013: Unhealthy 2 of 365 days2014: Good 128 of 365 days2014: Moderate 228 of 365 days2014: Unhealthy for Sensitive Groups 9 of 365 days2015: Good 89 of 365 days2015: Moderate 266 of 365 days2015: Unhealthy for Sensitive Groups 8 of 365 days2015: Unhealthy 2 of 365 days20152016: Good 84 of 366 days2016: Moderate 277 of 366 days2016: Unhealthy for Sensitive Groups 5 of 366 days2017: Good 150 of 365 days2017: Moderate 209 of 365 days2017: Unhealthy for Sensitive Groups 6 of 365 days2018: Good 170 of 365 days2018: Moderate 184 of 365 days2018: Unhealthy for Sensitive Groups 11 of 365 days2019: Good 190 of 365 days2019: Moderate 173 of 365 days2019: Unhealthy for Sensitive Groups 2 of 365 days2020: Good 236 of 366 days2020: Moderate 127 of 366 days2020: Unhealthy for Sensitive Groups 3 of 366 days20202021: Good 217 of 365 days2021: Moderate 145 of 365 days2021: Unhealthy for Sensitive Groups 2 of 365 days2021: Unhealthy 1 of 365 days2022: Good 205 of 365 days2022: Moderate 157 of 365 days2022: Unhealthy for Sensitive Groups 3 of 365 days2023: Good 149 of 365 days2023: Moderate 208 of 365 days2023: Unhealthy for Sensitive Groups 8 of 365 days2024: Good 179 of 366 days2024: Moderate 180 of 366 days2024: Unhealthy for Sensitive Groups 6 of 366 days2024: Unhealthy 1 of 366 days2025: Good 181 of 365 days2025: Moderate 183 of 365 days2025: Unhealthy for Sensitive Groups 1 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 year0501001501980: 90th percentile AQI 1121981: 90th percentile AQI 1331982: 90th percentile AQI 1001983: 90th percentile AQI 931984: 90th percentile AQI 931985: 90th percentile AQI 1121986: 90th percentile AQI 1291987: 90th percentile AQI 1151988: 90th percentile AQI 1151989: 90th percentile AQI 1011990: 90th percentile AQI 1221991: 90th percentile AQI 931992: 90th percentile AQI 1001993: 90th percentile AQI 1011994: 90th percentile AQI 931995: 90th percentile AQI 1121996: 90th percentile AQI 1001997: 90th percentile AQI 1011998: 90th percentile AQI 1081999: 90th percentile AQI 1262000: 90th percentile AQI 1352001: 90th percentile AQI 972002: 90th percentile AQI 872003: 90th percentile AQI 1002004: 90th percentile AQI 1002005: 90th percentile AQI 1052006: 90th percentile AQI 1012007: 90th percentile AQI 932008: 90th percentile AQI 842009: 90th percentile AQI 712010: 90th percentile AQI 802011: 90th percentile AQI 842012: 90th percentile AQI 802013: 90th percentile AQI 682014: 90th percentile AQI 772015: 90th percentile AQI 772016: 90th percentile AQI 742017: 90th percentile AQI 662018: 90th percentile AQI 712019: 90th percentile AQI 712020: 90th percentile AQI 592021: 90th percentile AQI 612022: 90th percentile AQI 652023: 90th percentile AQI 672024: 90th percentile AQI 692025: 90th percentile AQI 631980: Median AQI 351981: Median AQI 441982: Median AQI 371983: Median AQI 421984: Median AQI 451985: Median AQI 501986: Median AQI 481987: Median AQI 501988: Median AQI 451989: Median AQI 401990: Median AQI 451991: Median AQI 431992: Median AQI 451993: Median AQI 441994: Median AQI 421995: Median AQI 431996: Median AQI 431997: Median AQI 441998: Median AQI 451999: Median AQI 642000: Median AQI 642001: Median AQI 592002: Median AQI 572003: Median AQI 592004: Median AQI 562005: Median AQI 612006: Median AQI 612007: Median AQI 572008: Median AQI 552009: Median AQI 532010: Median AQI 572011: Median AQI 562012: Median AQI 542013: Median AQI 532014: Median AQI 542015: Median AQI 562016: Median AQI 552017: Median AQI 522018: Median AQI 512019: Median AQI 502020: Median AQI 452021: Median AQI 472022: Median AQI 482023: Median AQI 522024: Median AQI 512025: Median AQI 511980198519901995200020052010201520202025
  • 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
Fine particles (PM2.5)25871%
Ozone10629%
Coarse particles (PM10)1<1%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536518118310005163115PM2.5
202436617918061005169154PM2.5
202336514920880005267147PM2.5
202236520515730004865141PM2.5
202136521714521004761159PM2.5
202036623612730004559119PM2.5
201936519017320005071108PM2.5
2018365170184110005171126PM2.5
201736515020960005266126PM2.5
20163668427750005574146PM2.5
20153658926682005677156PM2.5
201436512822890005477133PM2.5
201336515021032005368166PM2.5
201236313122192005480151PM2.5
201136584259184005684164PM2.5
201036591257161005780159PM2.5
2009365152197133005371166PM2.5
2008366114236160005584143PM2.5
200736591247242105793202PM2.5
2006365592653380061101190PM2.5
20053656525335120061105192PM2.5
20043661082232681056100205PM2.5
20033657925219123059100215PM2.5
200236567278163105787201PM2.5
200136574259293005997174PM2.5
20003665424741204064135217PM2.5
19993654726138163064126212PM2.5
19983652309227106045108221Ozone
19973652438426111044101206Ozone
1996366249822681043100206Ozone
19953652456737124043112216Ozone
199436525483216104293204Ozone
1993365240882872044101204Ozone
1992366234982671045100203Ozone
1991365245891910204393208Ozone
19903652269027166045122234Ozone
1989365253742783040101220Ozone
19883662259034134045115220Ozone
198736518612836132050115208Ozone
198636519911038180048129197Ozone
198536518713031152050112225Ozone
1984366221113199404593227NO2
198336525282244304293210NO2
1982365275571896037100259Ozone
198136523068352210044133229Ozone
19803362465023116035112240Ozone

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 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem