Meridian 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 Meridian Air Today?
What High AQI Means for Your Lungs in Meridian
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 Meridian, ID Now
TL;DR
Filterbuy's live map above shows air pollution in Meridian, Idaho right now, from Idaho DEQ and EPA monitors, including the valley's reference station in Meridian. Under 50 is good for everyone; above 100, sensitive groups should limit time outdoors. We treat yellow as the time to get ready, since burn limits start at 60.
How to Read the Live Meridian Air Quality Map
Filterbuy built this page around one decision: open the windows or close up? The map refreshes hourly from the Idaho DEQ real-time air quality map, which pulls from 30+ state stations, and from EPA AirNow. Read it in this order:
The color. It tells you how long to stay outside.
The pollutant. Usually PM2.5, the fine particles in smoke and exhaust, or ground-level ozone. Ozone is a timing problem, since it breaks down indoors; smoke is a filtration problem.
The burn lines. Burn rules follow DEQ's forecast AQI, not the live number: outdoor burning stops at 60, fireplaces and woodstoves at 74.
The 100 line. At 100, start Filterbuy's indoor-air steps below.
Key Takeaways
The Treasure Valley's reference monitor, the St. Luke's Meridian NCore station, sits in Meridian, Idaho.
Meridian bans open burning at AQI 60 and woodstoves at 74, both still yellow.
Ada County earned an F for ozone in State of the Air 2026.
EPA recommends a MERV 13 or higher filter during smoke. Filterbuy's action line is AQI 100.
What Each Map Color Means in Meridian
Health guidance comes from EPA AirNow's AQI basics. Burn thresholds come from city ordinance 06-1221, applied to DEQ's forecast AQI, per DEQ's Treasure Valley ordinance chart.
| AQI | Category | EPA Guidance | Meridian Rule |
|---|---|---|---|
| 0–50 | Good (green) | Normal activity | Burning allowed unless a fire ban applies |
| 51–59 | Moderate (yellow) | Unusually sensitive people ease off | Burning allowed unless a fire ban applies |
| 60–73 | Moderate (yellow) | Unusually sensitive people ease off | No open or outdoor burning |
| 74–100 | Moderate (yellow) | Unusually sensitive people ease off | No fireplaces or woodstoves, certified or not |
| 101–150 | Unhealthy for Sensitive Groups (orange) | Sensitive groups shorten outdoor time | Burn limits stay; DEQ advisory likely |
| 151–200 | Unhealthy (red) | Everyone reduces outdoor exertion | Burn limits stay |
| 201–300 | Very Unhealthy (purple) | Everyone avoids outdoor exertion | Follow DEQ and local officials first |
| 301+ | Hazardous (maroon) | Stay indoors; follow official guidance | Follow DEQ and local officials first |
Health guidance: EPA AirNow. Burn thresholds apply to DEQ's forecast AQI under City of Meridian Ordinance 06-1221.
At Filterbuy, we call this the yellow trap: the map can read Moderate while a burn ban is on. Unincorporated Ada County pockets follow the county rule, which still allows certified woodstoves at 74. Unsure? Call Meridian Fire at (208) 888-1234.
Why the Meridian Reading Can Differ From Your Street
The AQI is an hourly estimate, so it can trail what you see.
NowCast lag. DEQ's live AQI uses NowCast, a weighted average of recent hours, so a fast-moving plume shows up a little late.
One strong monitor. Meridian's reading comes from the St. Luke's Meridian NCore site, which tracks six pollutants and was a ground site for NOAA's 2019 FIREX-AQ wildfire smoke study. Homes near I-84 or on the farm-country edge can still differ.
Two kinds of dots. On the AirNow Fire and Smoke Map, circles are official monitors and other shapes are low-cost sensors. Filterbuy's rule: trust circles for health decisions, and use sensors to see if smoke reached your block. Compare our Boise AQI map and Nampa AQI map.
Is Meridian's Air Safe to Breathe Right Now?
Meridian's air safety depends on the map's color, and EPA AirNow sets the health guidance for each. Below 100, air is fine for most people. From 101 to 150, people with asthma, COPD or heart disease, children, pregnant people and adults over 65 should limit time outside. Above 150, everyone should cut back. With a heart or lung condition, follow your doctor's plan, and get care right away for chest pain or trouble breathing.
Where Meridian Gets Its Air Forecasts and Burn Alerts
To plan for tomorrow, check DEQ's three-day Treasure Valley forecast. When air quality drops, DEQ issues an Air Quality Advisory that bans outdoor burning. Before lighting anything, check DEQ's outdoor burn map or call DEQ's burn hotline at (208) 373-0313. Filterbuy's free AQI alerts email you when air turns unhealthy.
How Meridian's Air Changes With the Seasons
| Season | Main Driver | Pollutant | What to Do at Home |
|---|---|---|---|
| Late fall to winter | Inversions trap wood smoke and exhaust | PM2.5 | Skip the fireplace; filter and run the fan |
| Windy spring and fall days | Road, construction and field dust | PM10 | Keep windows shut; check the filter |
| June to August | Sunlight reacts with vehicle and industrial emissions | Ozone | Exercise in the morning; close up by afternoon |
| July to September | Wildfire smoke from Idaho, Oregon and Washington | PM2.5 | MERV 13, fan On, HEPA in occupied rooms |
Seasonal pattern per Idaho DEQ forecasts and EPA-funded Treasure Valley inversion research.
In winter, a temperature inversion traps cold air on the valley floor, and an EPA-funded Boise State University study found PM2.5 drives those episodes. Meridian grew from 9,596 residents in 1990 to about 135,000 in 2023, so more chimneys share that air. Filterbuy's fireplace questions peak in January; see our fireplace and indoor air guide.
How Meridian's Air Compares With the Rest of the Country
The American Lung Association's State of the Air 2026 (2022–2024 data) ranks Meridian's metro among the most polluted:
Ozone: 24th worst. Ada County averaged 10.3 unhealthy ozone days a year, an F; the metro's prior figure was 5.7.
Short-term particles: 17th worst. Canyon County averaged 8.7 days, also an F.
Compare the state on Filterbuy's Idaho AQI map.
When Wildfire Smoke Settles Over Meridian
Smoke brings Meridian's sharpest spikes. In late July 2026, smoke from Oregon and Washington fires pushed valley air into the unhealthy range, Boise State Public Radio reported. DEQ then forecast Red, Unhealthy air for July 26 and 27, with an AQI of 180 on the 27th, KBOI reported.
Check AirNow and DEQ first, and follow any order to stay in, relocate or evacuate. At AQI 100, Filterbuy then takes these steps:
Put a MERV 13 filter in your HVAC. The EPA recommends MERV 13 or higher during smoky periods.
Switch the thermostat fan to On.
Run a portable HEPA air cleaner in each occupied room, bedrooms first. That's Filterbuy's rule. For sizing, EPA's cleaner air room guidance calls for a smoke CADR of at least two-thirds of the room's square footage, so a 300 sq ft bedroom needs roughly 200. Skip ionizers and ozone generators, since EPA advises against cleaners that produce ozone.
Close up the house and shut any fresh-air intake. Skip candles, frying, smoking and vacuuming without a sealed unit while smoke is in. EPA also warns that swamp coolers and single-hose portable ACs pull smoke inside, so if you can't stay cool at home, go somewhere you can.
Check the filter during smoke and replace it when it looks dark brown or black, which can be well before the usual interval. Keep spares on hand.
Without ducts, portable HEPA cleaners are your primary defense; our clean room setup guide shows how. A DIY box fan with a MERV 13 filter is a fair stopgap; per the EPA/AirNow indoor air filtration factsheet, use a certified 2012-or-newer fan and never leave it unattended. Follow the plumes on our Meridian wildfire smoke map.
Afterward, our most common call concerns a house that still smells like a campfire. Filterbuy's two-clock rule: filtration reduces airborne particles within days, but residue on surfaces takes weeks of cleaning. See our wildfire smoke recovery checklist.
Matching Your Filter to Meridian's AQI
For wildfire smoke, the answer is MERV 13. At AQI 100, Filterbuy recommends MERV 13 in the HVAC, the thermostat fan on On, a portable HEPA cleaner in each occupied room and the house closed up. Below 100, your usual filter is fine; just stock MERV 13 early.
| AQI on the Map | HVAC Filter | Room Layer |
|---|---|---|
| 0–50 | MERV 8 or MERV 11 | None needed |
| 51–99 | Install or stock MERV 13 | Size a HEPA cleaner now |
| 100–150 | MERV 13, fan On, house closed up | HEPA in each occupied room |
| 151–200 | Same, inspect filter often, keep spares | HEPA in each occupied room |
| 201–300 | Follow AirNow and DEQ first; MERV 13 is one layer | HEPA in a closed clean room |
| 301+ | Official guidance leads; filtration only supports it | HEPA in a closed clean room |
AQI 100 is Filterbuy's action line, the top of the Moderate range. Per EPA, most HVAC systems run MERV 13 without problems when it's replaced often.
The EPA notes that most furnaces run MERV 13 without equipment problems as long as it's replaced often. Sizing is the question Filterbuy's support team hears most. We cut custom air filters to the eighth of an inch and ship 600+ standard sizes free, with optional auto-delivery so spares arrive before smoke does. Pleated filters capture particles, but smoke odor is a gas, so see our Odor Eliminator line for odors and HEPA vs. MERV for why HEPA belongs in portable cleaners, not furnaces.
Meridian's Air From the Filter Slot
Filterbuy has made air filters in its U.S. plants for over a decade, and this page's author works with that team. Three lessons apply here.
We act at 100. By the time the map turns orange, smoke is already inside, so stock MERV 13 while it's yellow.
Filters work two seasons here. Smoke loads them in summer and inversions in winter, so check yours in late June and at Thanksgiving.
Save MERV 13 for smoke season. The mistake Filterbuy's customer service team sees most is running MERV 13 all year when MERV 8 or 11 would do.
Supporting Statistics
One old wood stove puts out as much PM2.5 as 8 old diesel school buses, hence Meridian's woodstove ban at 74. Source: U.S. EPA, Burn Wise
10.5% of Idaho adults (157,515 people) have asthma, above the 9.8% U.S. rate. That puts them in EPA's sensitive group. Source: American Lung Association, CDC BRFSS data
188,940 Idaho kids breathe unhealthy air, so filter their bedrooms first. Source: American Lung Association, State of the Air 2026
Frequently Asked Questions
What is the air quality in Meridian today?
Filterbuy's live map above shows the current AQI and main pollutant, updated hourly.
Is the air quality bad in Meridian today?
Check the map color. Orange (101–150) means sensitive groups cut back; red (151+) means everyone does.
Where can I check Meridian PM2.5 today?
The live map names the pollutant behind each reading, and DEQ's real-time map shows PM2.5 at St. Luke's Meridian.
What MERV rating do I need for wildfire smoke in Meridian?
MERV 13. EPA recommends MERV 13 or higher during smoke. Filterbuy tells customers to switch at AQI 100.
Can I use my fireplace in Meridian when the AQI is yellow?
Not always. Inside city limits, fireplaces and woodstoves stay off whenever DEQ forecasts 74 or higher.
Glossary
AQI: Air Quality Index, EPA's 0 to 500 pollution scale.
PM2.5: Fine particles 2.5 micrometers or smaller, found in smoke and exhaust.
Ozone: A ground-level gas formed in sunlight; the main part of smog.
Idaho DEQ: Idaho Department of Environmental Quality, the state air agency.
Treasure Valley: Southwest Idaho's Boise River valley.
NCore: EPA's multipollutant monitoring network.
NowCast: The EPA method for current AQI, weighted toward recent hours.
Temperature inversion: Warm air that traps cold, polluted air near the ground.
Air Quality Advisory: A DEQ notice that bans outdoor burning.
MERV: Minimum Efficiency Reporting Value, an HVAC filter's capture rating.
HEPA: High-efficiency particulate air, the standard for portable air cleaners.
CADR: Clean Air Delivery Rate, an air cleaner's cleaning speed.