EnviroNearby

Grant County, New Mexico air quality history

Daily Air Quality Index summaries from EPA monitors in Grant, New Mexico, 1986–2014.

87%
Good days in 2014
42
Median daily AQI, 2014
0
Days above 100 in 2014
310
Days with an AQI in 2014 (of 365)

In 2014, EPA reported a daily Air Quality Index (AQI) for Grant, New Mexico on 310 days. 271 of those days (87%) were in the Good range, and the median daily AQI was 42. That median is about the same as the typical monitored county in New Mexico (median 43.5 across 12 counties), and about the same as the typical monitored U.S. county (42). The main pollutant was ozone on 307 days. Across the years with fuller monitoring, the share of Good days rose: an average of 79% in 1986–1988 versus 90% in 2012–2014.

The most recent year with data for this county is 2014; EPA's files for 2015–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1995, 1996, 1997, 1998, 2003, 2004…) 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%1986: Good 108 of 151 days1986: Moderate 43 of 151 days19861987: Good 143 of 175 days1987: Moderate 32 of 175 days1988: Good 148 of 179 days1988: Moderate 31 of 179 days1989: Good 148 of 152 days1989: Moderate 4 of 152 days1990: Good 76 of 78 days1990: Moderate 2 of 78 days1991: Good 86 of 89 days1991: Moderate 3 of 89 days19911992: Good 66 of 69 days1992: Moderate 3 of 69 days1993: Good 70 of 71 days1993: Moderate 1 of 71 days1994: Good 82 of 83 days1994: Moderate 1 of 83 days1995: Good 86 of 88 days1995: Moderate 2 of 88 days1996: Good 78 of 78 days19961997: Good 81 of 81 days1998: Good 78 of 78 days1999: Good 131 of 140 days1999: Moderate 9 of 140 days2000: Good 153 of 163 days2000: Moderate 10 of 163 days2001: Good 155 of 164 days2001: Moderate 9 of 164 days20012002: Good 115 of 137 days2002: Moderate 22 of 137 days2003: Good 103 of 116 days2003: Moderate 13 of 116 days2004: Good 108 of 119 days2004: Moderate 11 of 119 days2005: Good 224 of 298 days2005: Moderate 70 of 298 days2005: Unhealthy for Sensitive Groups 4 of 298 days2006: Good 299 of 358 days2006: Moderate 57 of 358 days2006: Unhealthy for Sensitive Groups 2 of 358 days20062007: Good 324 of 364 days2007: Moderate 40 of 364 days2008: Good 335 of 365 days2008: Moderate 30 of 365 days2009: Good 329 of 346 days2009: Moderate 17 of 346 days2010: Good 290 of 365 days2010: Moderate 73 of 365 days2010: Unhealthy for Sensitive Groups 2 of 365 days2011: Good 291 of 348 days2011: Moderate 54 of 348 days2011: Unhealthy for Sensitive Groups 3 of 348 days20112012: Good 322 of 366 days2012: Moderate 44 of 366 days2013: Good 321 of 335 days2013: Moderate 14 of 335 days2014: Good 271 of 310 days2014: Moderate 39 of 310 days2014
  • 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 year0501001986: 90th percentile AQI 641987: 90th percentile AQI 591988: 90th percentile AQI 541989: 90th percentile AQI 411990: 90th percentile AQI 411991: 90th percentile AQI 341992: 90th percentile AQI 391993: 90th percentile AQI 321994: 90th percentile AQI 291995: 90th percentile AQI 311996: 90th percentile AQI 311997: 90th percentile AQI 271998: 90th percentile AQI 271999: 90th percentile AQI 472000: 90th percentile AQI 442001: 90th percentile AQI 462002: 90th percentile AQI 542003: 90th percentile AQI 522004: 90th percentile AQI 482005: 90th percentile AQI 712006: 90th percentile AQI 582007: 90th percentile AQI 522008: 90th percentile AQI 502009: 90th percentile AQI 482010: 90th percentile AQI 612011: 90th percentile AQI 582012: 90th percentile AQI 512013: 90th percentile AQI 482014: 90th percentile AQI 581986: Median AQI 361987: Median AQI 341988: Median AQI 401989: Median AQI 271990: Median AQI 251991: Median AQI 211992: Median AQI 231993: Median AQI 201994: Median AQI 201995: Median AQI 191996: Median AQI 211997: Median AQI 201998: Median AQI 191999: Median AQI 272000: Median AQI 242001: Median AQI 242002: Median AQI 282003: Median AQI 302004: Median AQI 272005: Median AQI 432006: Median AQI 422007: Median AQI 422008: Median AQI 402009: Median AQI 412010: Median AQI 452011: Median AQI 432012: Median AQI 412013: Median AQI 402014: Median AQI 421986199119962001200620112014
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2014

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
Ozone30799%
Coarse particles (PM10)31%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2014310271390000425890Ozone
2013335321140000404871Ozone
2012366322440000415184Ozone
20113482915430004358126Ozone
20103652907320004561126Ozone
2009346329170000414887Ozone
2008365335300000405087Ozone
2007364324400000425280Ozone
20063582995720004258112Ozone
20052982247040004371115Ozone
2004119108110000274860PM2.5
2003116103130000305276PM2.5
2002137115220000285493PM2.5
200116415590000244679PM2.5
2000163153100000244458PM2.5
199914013190000274769PM2.5
1998787800000192732PM10
1997818100000202748PM10
1996787800000213144PM10
1995888620000193186PM10
1994838210000202957PM10
1993717010000203253PM10
1992696630000233964PM10
1991898630000213460PM10
1990787620000254158PM10
198915214840000274183PM10
1988179148310000405465PM10
1987175143320000345983PM10
1986151108430000366486PM10

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 New Mexico

Source: U.S. EPA AirData, “Annual AQI by County” files for 1986–2014 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem