EnviroNearby

Calcasieu Parish, Louisiana air quality history

Daily Air Quality Index summaries from EPA monitors in Calcasieu, Louisiana, 1980–2025.

62%
Good days in 2025
47
Median daily AQI, 2025
3
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 Calcasieu, Louisiana on 365 days. 227 of those days (62%) were in the Good range, and the median daily AQI was 47. 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 229 days. Across the years with fuller monitoring, the share of Good days fell: an average of 78% in 1980–1982 versus 51% 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 218 of 263 days1980: Moderate 26 of 263 days1980: Unhealthy for Sensitive Groups 15 of 263 days1980: Unhealthy 1 of 263 days1980: Very Unhealthy 3 of 263 days19801981: Good 224 of 320 days1981: Moderate 63 of 320 days1981: Unhealthy for Sensitive Groups 27 of 320 days1981: Unhealthy 6 of 320 days1982: Good 260 of 325 days1982: Moderate 40 of 325 days1982: Unhealthy for Sensitive Groups 17 of 325 days1982: Unhealthy 7 of 325 days1982: Very Unhealthy 1 of 325 days1983: Good 293 of 358 days1983: Moderate 44 of 358 days1983: Unhealthy for Sensitive Groups 15 of 358 days1983: Unhealthy 6 of 358 days1984: Good 313 of 365 days1984: Moderate 37 of 365 days1984: Unhealthy for Sensitive Groups 12 of 365 days1984: Unhealthy 1 of 365 days1984: Very Unhealthy 2 of 365 days1985: Good 283 of 365 days1985: Moderate 55 of 365 days1985: Unhealthy for Sensitive Groups 19 of 365 days1985: Unhealthy 8 of 365 days19851986: Good 279 of 365 days1986: Moderate 61 of 365 days1986: Unhealthy for Sensitive Groups 18 of 365 days1986: Unhealthy 6 of 365 days1986: Very Unhealthy 1 of 365 days1987: Good 245 of 364 days1987: Moderate 74 of 364 days1987: Unhealthy for Sensitive Groups 34 of 364 days1987: Unhealthy 10 of 364 days1987: Very Unhealthy 1 of 364 days1988: Good 246 of 366 days1988: Moderate 74 of 366 days1988: Unhealthy for Sensitive Groups 31 of 366 days1988: Unhealthy 14 of 366 days1988: Very Unhealthy 1 of 366 days1989: Good 287 of 365 days1989: Moderate 52 of 365 days1989: Unhealthy for Sensitive Groups 19 of 365 days1989: Unhealthy 7 of 365 days1990: Good 266 of 365 days1990: Moderate 65 of 365 days1990: Unhealthy for Sensitive Groups 28 of 365 days1990: Unhealthy 5 of 365 days1990: Very Unhealthy 1 of 365 days19901991: Good 267 of 363 days1991: Moderate 66 of 363 days1991: Unhealthy for Sensitive Groups 17 of 363 days1991: Unhealthy 12 of 363 days1991: Very Unhealthy 1 of 363 days1992: Good 262 of 366 days1992: Moderate 81 of 366 days1992: Unhealthy for Sensitive Groups 20 of 366 days1992: Unhealthy 3 of 366 days1993: Good 281 of 365 days1993: Moderate 55 of 365 days1993: Unhealthy for Sensitive Groups 23 of 365 days1993: Unhealthy 4 of 365 days1993: Very Unhealthy 2 of 365 days1994: Good 291 of 365 days1994: Moderate 58 of 365 days1994: Unhealthy for Sensitive Groups 12 of 365 days1994: Unhealthy 4 of 365 days1995: Good 268 of 365 days1995: Moderate 69 of 365 days1995: Unhealthy for Sensitive Groups 22 of 365 days1995: Unhealthy 6 of 365 days19951996: Good 301 of 366 days1996: Moderate 51 of 366 days1996: Unhealthy for Sensitive Groups 14 of 366 days1997: Good 252 of 364 days1997: Moderate 75 of 364 days1997: Unhealthy for Sensitive Groups 30 of 364 days1997: Unhealthy 6 of 364 days1997: Very Unhealthy 1 of 364 days1998: Good 281 of 365 days1998: Moderate 53 of 365 days1998: Unhealthy for Sensitive Groups 21 of 365 days1998: Unhealthy 10 of 365 days1999: Good 215 of 365 days1999: Moderate 119 of 365 days1999: Unhealthy for Sensitive Groups 26 of 365 days1999: Unhealthy 5 of 365 days2000: Good 127 of 366 days2000: Moderate 195 of 366 days2000: Unhealthy for Sensitive Groups 36 of 366 days2000: Unhealthy 8 of 366 days20002001: Good 150 of 365 days2001: Moderate 199 of 365 days2001: Unhealthy for Sensitive Groups 13 of 365 days2001: Unhealthy 3 of 365 days2002: Good 196 of 365 days2002: Moderate 161 of 365 days2002: Unhealthy for Sensitive Groups 8 of 365 days2003: Good 123 of 365 days2003: Moderate 224 of 365 days2003: Unhealthy for Sensitive Groups 15 of 365 days2003: Unhealthy 3 of 365 days2004: Good 170 of 366 days2004: Moderate 183 of 366 days2004: Unhealthy for Sensitive Groups 12 of 366 days2004: Unhealthy 1 of 366 days2005: Good 108 of 348 days2005: Moderate 215 of 348 days2005: Unhealthy for Sensitive Groups 22 of 348 days2005: Unhealthy 3 of 348 days20052006: Good 133 of 365 days2006: Moderate 215 of 365 days2006: Unhealthy for Sensitive Groups 15 of 365 days2006: Unhealthy 2 of 365 days2007: Good 160 of 365 days2007: Moderate 196 of 365 days2007: Unhealthy for Sensitive Groups 9 of 365 days2008: Good 161 of 366 days2008: Moderate 198 of 366 days2008: Unhealthy for Sensitive Groups 7 of 366 days2009: Good 179 of 365 days2009: Moderate 176 of 365 days2009: Unhealthy for Sensitive Groups 8 of 365 days2009: Unhealthy 2 of 365 days2010: Good 147 of 365 days2010: Moderate 209 of 365 days2010: Unhealthy for Sensitive Groups 9 of 365 days20102011: Good 169 of 365 days2011: Moderate 187 of 365 days2011: Unhealthy for Sensitive Groups 9 of 365 days2012: Good 199 of 366 days2012: Moderate 161 of 366 days2012: Unhealthy for Sensitive Groups 6 of 366 days2013: Good 175 of 365 days2013: Moderate 187 of 365 days2013: Unhealthy for Sensitive Groups 3 of 365 days2014: Good 201 of 365 days2014: Moderate 161 of 365 days2014: Unhealthy for Sensitive Groups 3 of 365 days2015: Good 149 of 365 days2015: Moderate 212 of 365 days2015: Unhealthy for Sensitive Groups 3 of 365 days2015: Unhealthy 1 of 365 days20152016: Good 126 of 366 days2016: Moderate 239 of 366 days2016: Unhealthy for Sensitive Groups 1 of 366 days2017: Good 118 of 365 days2017: Moderate 244 of 365 days2017: Unhealthy for Sensitive Groups 3 of 365 days2018: Good 145 of 365 days2018: Moderate 214 of 365 days2018: Unhealthy for Sensitive Groups 6 of 365 days2019: Good 131 of 365 days2019: Moderate 234 of 365 days2020: Good 179 of 349 days2020: Moderate 169 of 349 days2020: Unhealthy for Sensitive Groups 1 of 349 days20202021: Good 171 of 365 days2021: Moderate 193 of 365 days2021: Unhealthy 1 of 365 days2022: Good 167 of 365 days2022: Moderate 198 of 365 days2023: Good 139 of 365 days2023: Moderate 221 of 365 days2023: Unhealthy for Sensitive Groups 5 of 365 days2024: Good 194 of 366 days2024: Moderate 168 of 366 days2024: Unhealthy for Sensitive Groups 4 of 366 days2025: Good 227 of 365 days2025: Moderate 135 of 365 days2025: Unhealthy for Sensitive Groups 3 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 841981: 90th percentile AQI 1051982: 90th percentile AQI 801983: 90th percentile AQI 771984: 90th percentile AQI 611985: 90th percentile AQI 901986: 90th percentile AQI 931987: 90th percentile AQI 1151988: 90th percentile AQI 1151989: 90th percentile AQI 871990: 90th percentile AQI 971991: 90th percentile AQI 901992: 90th percentile AQI 871993: 90th percentile AQI 971994: 90th percentile AQI 771995: 90th percentile AQI 971996: 90th percentile AQI 671997: 90th percentile AQI 1011998: 90th percentile AQI 971999: 90th percentile AQI 972000: 90th percentile AQI 1052001: 90th percentile AQI 812002: 90th percentile AQI 702003: 90th percentile AQI 802004: 90th percentile AQI 792005: 90th percentile AQI 922006: 90th percentile AQI 852007: 90th percentile AQI 802008: 90th percentile AQI 772009: 90th percentile AQI 712010: 90th percentile AQI 762011: 90th percentile AQI 752012: 90th percentile AQI 672013: 90th percentile AQI 692014: 90th percentile AQI 642015: 90th percentile AQI 712016: 90th percentile AQI 662017: 90th percentile AQI 652018: 90th percentile AQI 692019: 90th percentile AQI 652020: 90th percentile AQI 642021: 90th percentile AQI 652022: 90th percentile AQI 672023: 90th percentile AQI 742024: 90th percentile AQI 642025: 90th percentile AQI 611980: Median AQI 301981: Median AQI 391982: Median AQI 371983: Median AQI 341984: Median AQI 311985: Median AQI 381986: Median AQI 361987: Median AQI 421988: Median AQI 431989: Median AQI 381990: Median AQI 411991: Median AQI 381992: Median AQI 411993: Median AQI 391994: Median AQI 361995: Median AQI 391996: Median AQI 361997: Median AQI 391998: Median AQI 391999: Median AQI 462000: Median AQI 552001: Median AQI 532002: Median AQI 482003: Median AQI 562004: Median AQI 522005: Median AQI 572006: Median AQI 552007: Median AQI 522008: Median AQI 522009: Median AQI 512010: Median AQI 532011: Median AQI 522012: Median AQI 492013: Median AQI 512014: Median AQI 472015: Median AQI 532016: Median AQI 532017: Median AQI 542018: Median AQI 532019: Median AQI 532020: Median AQI 492021: Median AQI 512022: Median AQI 522023: Median AQI 542024: Median AQI 492025: Median AQI 471980198519901995200020052010201520202025
  • 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)22963%
Ozone13637%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536522713530004761108PM2.5
202436619416840004964147PM2.5
202336513922150005474133PM2.5
202236516719800005267100PM2.5
202136517119301005165156PM2.5
202034917916910004964116PM2.5
20193651312340000536590PM2.5
201836514521460005369108PM2.5
201736511824430005465115PM2.5
201636612623910005366112PM2.5
201536514921231005371156PM2.5
201436520116130004764133PM2.5
201336517518730005169115PM2.5
201236619916160004967136PM2.5
201136516918790005275133PM2.5
201036514720990005376147PM2.5
200936517917682005171177PM2.5
200836616119870005277119PM2.5
200736516019690005280136PM2.5
2006365133215152005585177PM2.5
2005348108215223005792164PM2.5
2004366170183121005279154PM2.5
2003365123224153005680187PM2.5
200236519616180004870136PM2.5
2001365150199133005381169PM2.5
20003661271953680055105174PM2.5
1999365215119265004697174Ozone
1998365281532110003997185Ozone
1997364252753061039101212Ozone
199636630151140003667147Ozone
199536526869226003997185Ozone
199436529158124003677179Ozone
199336528155234203997212Ozone
199236626281203004187169Ozone
1991363267661712103890212Ozone
199036526665285104197220Ozone
198936528752197003887174Ozone
19883662467431141043115201Ozone
19873642457434101042115210Ozone
198636527961186103693201Ozone
198536528355198003890200Ozone
198436531337121203161216Ozone
198335829344156003477177Ozone
198232526040177103780220Ozone
1981320224632760039105190Ozone
198026321826151303084238Ozone

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