EnviroNearby

Grenada County, Mississippi air quality history

Daily Air Quality Index summaries from EPA monitors in Grenada, Mississippi, 2002–2018.

73%
Good days in 2018
36
Median daily AQI, 2018
0
Days above 100 in 2018
105
Days with an AQI in 2018 (of 365)

In 2018, EPA reported a daily Air Quality Index (AQI) for Grenada, Mississippi on 105 days. 77 of those days (73%) were in the Good range, and the median daily AQI was 36. That median is lower than the typical monitored county in Mississippi (median 46 across 10 counties), and lower than the typical monitored U.S. county (41). The main pollutant was fine particles (PM2.5) on 105 days.

EPA did not report an AQI for every day of 2018 here (105 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 2018; EPA's files for 2019–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (2010, 2011, 2015, 2016, 2017, 2018…) 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%2002: Good 14 of 50 days2002: Moderate 35 of 50 days2002: Unhealthy for Sensitive Groups 1 of 50 days20022003: Good 20 of 56 days2003: Moderate 36 of 56 days20032004: Good 14 of 47 days2004: Moderate 33 of 47 days20042005: Good 11 of 49 days2005: Moderate 38 of 49 days20052006: Good 6 of 10 days2006: Moderate 4 of 10 days20062007: Good 41 of 99 days2007: Moderate 58 of 99 days20072008: Good 51 of 115 days2008: Moderate 64 of 115 days20082009: Good 57 of 107 days2009: Moderate 50 of 107 days20092010: Good 58 of 119 days2010: Moderate 61 of 119 days20102011: Good 67 of 106 days2011: Moderate 39 of 106 days20112015: Good 97 of 116 days2015: Moderate 19 of 116 days20152016: Good 79 of 109 days2016: Moderate 30 of 109 days20162017: Good 79 of 103 days2017: Moderate 24 of 103 days20172018: Good 77 of 105 days2018: Moderate 28 of 105 days2018
  • 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 year0501002002: 90th percentile AQI 752003: 90th percentile AQI 742004: 90th percentile AQI 702005: 90th percentile AQI 782006: 90th percentile AQI 622007: 90th percentile AQI 752008: 90th percentile AQI 642009: 90th percentile AQI 612010: 90th percentile AQI 622011: 90th percentile AQI 612015: 90th percentile AQI 542016: 90th percentile AQI 562017: 90th percentile AQI 542018: 90th percentile AQI 552002: Median AQI 572003: Median AQI 582004: Median AQI 532005: Median AQI 572006: Median AQI 472007: Median AQI 532008: Median AQI 522009: Median AQI 492010: Median AQI 512011: Median AQI 472015: Median AQI 342016: Median AQI 412017: Median AQI 402018: Median AQI 3620022003200420052006200720082009201020112015201620172018
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2018

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)105100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
201810577280000365582PM2.5
201710379240000405463PM2.5
201610979300000415669PM2.5
201511697190000345469PM2.5
201110667390000476177PM2.5
201011958610000516277PM2.5
200910757500000496175PM2.5
200811551640000526482PM2.5
20079941580000537587PM2.5
200610640000476262PM2.5
20054911380000577895PM2.5
20044714330000537081PM2.5
20035620360000587484PM2.5
200250143510005775118PM2.5

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 Mississippi

Source: U.S. EPA AirData, “Annual AQI by County” files for 2002–2018 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem