Murfreesboro Real-Time AQI Tracker
Get Alerts For Unhealthy AQI In Your Area
When air quality in your area reaches unhealthy levels, we'll send you a quick alert, along with expert tips on how to reduce your exposure.
What's Actually In Murfreesboro Air Today?
What High AQI Means for Your Lungs in Murfreesboro
How to Read AQI
The Air Quality Index (AQI) measures how polluted the air is and how it may affect your health.
0–50 (Good): Air quality is satisfactory.
51–100 (Moderate): Acceptable, but some pollutants may pose minor concerns.
101–150 (Unhealthy for Sensitive Groups)
151–200 (Unhealthy)
201–300 (Very Unhealthy)
301+ (Hazardous)
Moderate
Still okay for most, but if you have asthma or allergies, take it easy and avoid long outdoor workouts.
Shop MERV 11 filters→What's the Right Filter for Your AQI Level?
Check Today's Live Real Time Air Quality Index AQI Map in Murfreesboro, TN Now
By Michelle Wan, Brand Manager and Air Quality Writer. Technically reviewed by David Clark, Licensed HVAC Technician. Published September 7, 2026. Updated September 7, 2026.
TL;DR
Murfreesboro's live air quality index comes from monitors outside Rutherford County, not from a station inside the city. The nearest of them sits 16 miles north-northeast at Cedars of Lebanon in Wilson County, and it measures ozone only. So treat today's Murfreesboro AQI as a regional estimate rather than a street-level reading, then act on it indoors, where you actually control the air.
Key Takeaways
Tennessee's 2025 monitoring network plan lists no permanent regulatory air monitor in Rutherford County.
Nashville's Metro Public Health Department forecasts Rutherford County air daily. Ozone runs March 1 to October 31, fine particles year-round.
The American Lung Association assigns Rutherford County no air quality grade, because its monitoring record is incomplete.
EPA lowered the annual fine particle standard to 9.0 micrograms per cubic meter on May 6, 2024, moving the AQI 50 breakpoint with it.
Murfreesboro Air Quality Today, And What The Number Is Measuring
The AQI reading for Murfreesboro right now reports whichever pollutant is highest at this hour, almost always ground-level ozone or the fine particles known as PM2.5. The scale runs from 0 to 500 across six color bands, and anything at or below 100 is satisfactory for most people. Above that line, sensitive groups feel it first.
What nearly every Murfreesboro air quality page leaves out is where that number comes from. Rutherford County holds roughly 377,000 residents inside the Nashville-Davidson-Murfreesboro-Franklin metro, and federal rules require that metro to report a daily AQI. It does. The instrument doing the measuring is simply not in Murfreesboro. For the wider picture, see the live air quality index AQI map for Tennessee.
Where Murfreesboro's AQI Reading Actually Comes From
Filterbuy went through Tennessee's 2025 monitoring network plan looking for a Murfreesboro entry, and there is not one. Rutherford County appears nowhere in the state's regulatory inventory, so the number you see is interpolated from surrounding stations and a scattering of low-cost sensors.
Sites from the 2025 Tennessee Annual Monitoring Network Plan. Distances calculated by Filterbuy. Green marks the monitors that measure fine particles.
We built that table at Filterbuy, measuring from the Murfreesboro city coordinate to each monitor's published coordinate. It rewards a second look. The closest monitor measures ozone and nothing else, and the nearest one measuring fine particles sits 34 miles away on the far side of Nashville. On a winter inversion morning, nothing within 30 miles of the square is measuring PM2.5 at all.
Tennessee describes Cedars of Lebanon as sitting downwind of Murfreesboro and runs it to capture the area's highest ozone, which means that monitor catches the pollution leaving your city rather than the pollution sitting over it. Much of what you are reading is the live air quality index AQI map for Nashville wearing a Murfreesboro label.
The Filterbuy Three Question Method For A Murfreesboro AQI Reading
Filterbuy built this sequence for the situation Murfreesboro is actually in. An interpolated reading deserves three questions before you let it change your day.
One: Which Pollutant Is Driving It?
Ozone peaks on hot, stagnant afternoons from March into October. Fine particles peak on still winter mornings when inversions trap them low. The label tells you which clock to watch and, once a reading turns orange, what to do when AQI climbs above 100.
Two: Where Is The Wind Coming From?
A southerly flow brings you air the Nashville monitors have not sampled yet, so the published number runs behind your actual conditions. A northerly flow means Cedars of Lebanon is reading air that has already crossed town.
Three: What Sits Closer To You Than The Monitor?
Interstate 24, US 231, and State Route 840 carry heavy traffic through Rutherford County. If you live or work within a few hundred yards of one, your exposure runs higher than any regional average will show.
How To Get A Reading Closer To Your Street
The four regulatory monitors are the official record, not the only data. Tennessee runs a network of low-cost Clarity and PurpleAir sensors to widen fine particle coverage, and that feed is public.
Open the AirNow Fire and Smoke Map. It carries the state sensor feed alongside the regulatory sites, and sensors sit closer than 16 miles.
Read a sensor as spatial detail rather than a compliance number. It shows you where the air changes across town, but it does not set the official AQI.
On a smoke day, trust the pattern across several nearby sensors ahead of one distant monitor.
What Drives Murfreesboro Air Quality Through The Year
Murfreesboro sits in the Central Basin at roughly 610 feet, a shallow bowl ringed by the higher Highland Rim. Cool air settles into it overnight and holds whatever the day produced.
Summer belongs to ozone, which is why Tennessee forecasts it only from March 1 through October 31, and Rutherford County stopped running emissions inspections in January 2022. Winter belongs to fine particles, pinned near the ground by inversions and wood smoke. Then spring layers pollen on top of all of it, and the AQI does not measure pollen at all.
AQI Categories And What Each Band Means Inside Your Home
The six bands are federal and do not shift from one city to the next. The ranges below are the EPA's, where 100 is still the top of Moderate and orange starts at 101. Filterbuy acts one point earlier, at 100. If you want the math, we cover how the air quality index is calculated separately.
AQI ranges are the federal EPA categories. Indoor actions are Filterbuy guidance.
Expert Perspective From The Filterbuy Team
I went looking for the Murfreesboro monitor and there is not one. That is not a scandal, it is how the federal network is built, by metro rather than by city. It does change how much weight I would put on a single number, and nobody was saying that to Murfreesboro readers.
Michelle Wan, Brand Manager and Air Quality Writer, Filterbuy
3 Supporting Statistics That Show What Murfreesboro Air Really Looks Like
1. The Nashville Metro Sits One Tenth Of A Microgram From The Federal Limit
Murfreesboro's official number is measured in Davidson County, not here.
Nashville area PM2.5 design value, 2022 to 2024 preliminary: 9.3 micrograms per cubic meter
Federal annual standard: 9.0 micrograms per cubic meter
Same value with Canadian wildfire days excluded: exactly 9.0
Prior 2021 to 2023 value: 9.6
Monitors in that calculation located in Rutherford County: zero
Source: TDEC Division of Air Pollution Control, Air Quality Update, August 2025 https://www.tn.gov/content/dam/tn/environment/air/documents/apc_air-quality-update.pdf
2. 427,343 Tennessee Children Live Where The Air Earns A Failing Grade
The 2026 State of the Air report grades counties on data from 2022 to 2024.
Tennessee children in counties graded F on at least one measure: 427,343
Nashville-Davidson-Murfreesboro metro ozone grade: F, downgraded this cycle
Rutherford County grade: none issued
Reason: the monitoring record covers at least one year but not all three
Source: American Lung Association State of the Air, Rutherford County Tennessee https://www.lung.org/research/sota/city-rankings/states/tennessee/rutherford
3. The Good Air Cutoff Tightened By 25 Percent In One Rulemaking
The change took effect May 6, 2024, and reset the primary annual PM2.5 standard.
Annual PM2.5 standard: lowered from 12.0 to 9.0 micrograms per cubic meter
AQI 50 breakpoint: reset to 9.0 to match
AQI 100 and 150 breakpoints: held at 35.4 and 55.4
Any chart still printing 12.0: describing a standard that expired over two years ago
Source: Federal Register, Reconsideration of the NAAQS for Particulate Matter https://www.federalregister.gov/documents/2024/03/06/2024-02637/reconsideration-of-the-national-ambient-air-quality-standards-for-particulate-matter
What To Do When Murfreesboro's AQI Reaches 100
AQI 100 is where Filterbuy tells customers to move. The EPA recommends a high-efficiency filter rated MERV 13 or higher in a central system during smoke events, and it sets no AQI threshold for making that switch. The 100 line is ours.
Put MERV 13 in the HVAC. The central system moves far more air than any portable unit, so this is the whole-home layer.
Set the thermostat fan to On rather than Auto. On Auto the system only filters while it is heating or cooling.
Run a portable HEPA air cleaner in each occupied room, bedrooms first. Pick a unit whose smoke CADR is at least two-thirds of the room's square footage, so a 300 square foot bedroom wants a smoke CADR near 200. Skip anything that makes ozone, ionizers included.
Close the house up. Windows and doors shut, and hold off on candles, frying, vacuuming without a sealed unit, and smoking while smoke is in the air.
Check the live map each morning and note the pollutant, not just the color.
No ductwork? In an apartment, a window-unit home, or an older house without central air, portable HEPA cleaners are the primary defense rather than a supplement.
During a smoke event, check the filter and change it once it looks dirty, dark brown or black. That can arrive well before the normal replacement interval, so keep spares on hand. From 201 upward, AirNow and your local air agency lead, and filtration is one layer rather than the answer.
Frequently Asked Questions
Glossary Of Terms On This Page
AQI (Air Quality Index). The federal 0 to 500 scale for daily outdoor air quality. It reflects the highest-scoring pollutant at a given hour, not an average.
PM2.5 (Fine Particulate Matter). Airborne particles 2.5 micrometers or smaller, from combustion and smoke, small enough to reach deep into the lungs.
Ground-Level Ozone. A lung-irritating gas formed when heat and sunlight react with vehicle and industrial emissions. It dominates Middle Tennessee air March through October.
Regulatory Monitor. An instrument meeting federal reference or equivalent standards, whose data can determine compliance. Low-cost sensors cannot.
Temperature Inversion. Warmer air above cooler surface air, trapping pollutants near the ground. Common on calm winter mornings.