Aurora 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 Aurora Air Today?
What High AQI Means for Your Lungs in Aurora
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?
Live Air Quality Index AQI Map Aurora Colorado Today | Filterbuy.com
The live map above shows Aurora, Colorado's current AQI across the city and refreshes every hour. Most of Aurora's bad-air days come from ground-level ozone in summer, with wildfire smoke and winter inversions causing spikes in fine particles. Filterbuy, a U.S. air filter manufacturer since 2013, built this page, and a licensed HVAC technician reviews its advice.
This page covers Aurora, Colorado, the Front Range city just east of Denver that spans Arapahoe, Adams, and Douglas counties, not Aurora, Illinois, or Aurora, Ohio.
TL;DR
Green (0–50) is fine for everyone. Once it reaches orange (101–150), children, older adults, and people with asthma or heart disease should ease off outdoors. When smoke pushes the AQI to 100 or higher, Filterbuy recommends MERV 13 in your HVAC, the fan set to On, and a portable HEPA air cleaner in each occupied room. Ozone calls for good timing and closed windows instead.
Key Takeaways
Ozone is Aurora's chronic problem. The Denver-Aurora-Greeley metro ranked 8th worst in the U.S. for ozone in the American Lung Association's 2026 State of the Air report.
AQI 100 is Filterbuy's action line for smoke. At that point, switch to MERV 13, set the fan to On, run a portable HEPA air cleaner in each occupied room, and close the house up.
Filters capture particles, not ozone. MERV 13 is the tier Filterbuy recommends for wildfire smoke, but no pleated HVAC filter removes ozone gas.
What Does Aurora's AQI Number Mean Today?
The Air Quality Index (AQI) is the U.S. Environmental Protection Agency's color-coded scale for daily air pollution. Aurora's number draws on readings for ground-level ozone, particle pollution (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide, and whichever pollutant scores highest sets the AQI for the day.
Source: U.S. EPA AirNow, AQI Basics (airnow.gov/aqi/aqi-basics).
When Is Aurora's Air Quality Worst, and What Causes It?
In summer, strong high-altitude sunlight turns vehicle, industrial, and oil-and-gas emissions into ground-level ozone, which peaks in the afternoon. Fine particles (PM2.5) peak in winter, when temperature inversions trap pollution near the ground, and from late spring through fall, when wildfire smoke drifts in.
How Bad Is Air Pollution in Aurora, Colorado?
Two numbers show the scale of Aurora's ozone problem.
8th worst U.S. metro for ozone. Jefferson County, the metro's worst county, averaged 29.7 weighted unhealthy ozone days per year from 2022 to 2024 and earned an F. (American Lung Association, 2026)
66 ozone exceedance days in 2026. The Regional Air Quality Council counted 66 days this year when ozone topped the federal 70 parts-per-billion standard in the Denver Metro/North Front Range area. Since 2000, only 2021 was worse, with 67 days. (RAQC, 2026)
Can an Air Filter Remove Ozone From Your Home?
No. Filterbuy makes air filters, and we'd rather tell you that than sell you one for a job it can't do. Ground-level ozone is a gas, and gases pass straight through any pleated filter, including the MERV 8, 11, and 13 filters we build in our U.S. plants.
What does work is timing. Ozone peaks from midday through early evening, so keep windows and doors closed during those hours and move exercise to the morning. On ozone Action Days, check AirNow for guidance on who should limit time outside.
Which MERV Filter Matches Today's AQI in Aurora?
For wildfire smoke, the answer is MERV 13. Filterbuy makes all three ratings, so we have no reason to push the priciest one. MERV 8 suits most homes on clean-air days, and MERV 11 suits most households with pets or allergies. Step up to MERV 13 when wildfire smoke is in the forecast. During smoke events, the EPA recommends a filter rated MERV 13 or higher in a central HVAC system.
The EPA also notes that most furnaces and HVAC systems can run a MERV 13 filter without equipment problems, as long as the filter is replaced often. Just match the size printed on your current filter.
What Should I Do on High-AQI Days in Aurora?
Check AirNow and CDPHE's advisories first, then see which pollutant is raising Aurora's AQI. If it's smoke or PM2.5 (the fine particles in smoke) and the AQI reaches 100, Filterbuy recommends four steps: put a MERV 13 filter in your HVAC, set the thermostat fan to On, run a portable HEPA air cleaner in each occupied room (bedrooms first), and close the house up. If you have asthma, COPD, or a heart condition, follow the plan you've made with your doctor.
Closing the house up means windows and doors shut, and no candles, frying, smoking, or vacuuming without a sealed unit while smoke is in.
Why two layers. MERV 13 treats the whole house, and a portable HEPA air cleaner treats one room more intensively. HEPA filters don't belong in a furnace slot (MERV 13 vs. HEPA). For a bedroom, the EPA suggests a cleaner with a smoke CADR (clean air delivery rate) of at least two-thirds of the room's square footage, so a 300 sq ft room needs a smoke CADR of about 200. The EPA also advises against air cleaners that produce ozone (EPA clean room guide).
No central HVAC? In apartments or homes with window units, portable HEPA air cleaners are your main defense, so start with the bedrooms.
Check the filter during smoke. Smoke loads a filter much faster than normal. Replace it when it looks dark brown or black, which can be well before its usual interval, and keep spares on hand. Auto-delivery keeps the next one coming.
Supporting Statistics
$211 million to $580 million a year. Colorado School of Public Health researchers estimate that's the yearly savings in ozone-related health costs if the Front Range met the federal 70 ppb standard (Regional Air Quality Council, 2026).
Less than 25% of the time. Home HVAC systems usually run less than 25% of the time, even in heating and cooling seasons (U.S. EPA, Guide to Air Cleaners in the Home). Because a filter only cleans air that moves through it, Filterbuy recommends setting the fan to "on" during smoke events.
As low as 10% of outdoor levels. On summer days, keeping the windows closed and the air conditioning on can bring indoor ozone down to as little as 10% of the level outside (U.S. EPA, Ozone and Your Patients' Health).
Where Can I Check Official Aurora Air Quality Data?
AirNow Fire and Smoke Map: wildfire smoke tracking.
CDPHE advisories: forecasts and Action Day Alerts (303-758-4848).
City of Aurora air quality network: 15 city-sponsored stations across every Ward, reporting in real time.
Filterbuy's live Colorado AQI map: statewide conditions. Nearby: Denver, Lakewood, and Thornton live AQI maps.
Frequently Asked Questions
Is the Air Quality Safe in Aurora Today?
Most people can go about their day when the AQI is 100 or lower. That's the top of the EPA's Moderate range. Between 101 and 150, children, older adults, and people with asthma or heart disease should limit long or strenuous time outdoors. Above 150, everyone should cut back.
What MERV Rating Do I Need for Wildfire Smoke in Aurora?
MERV 13. It's the tier Filterbuy recommends for smoke, and the EPA recommends MERV 13 or higher in a central HVAC system during smoke events. Pair it with a portable HEPA air cleaner in each occupied room once smoke pushes the AQI to 100.
How Often Does the Aurora AQI Map Update?
Filterbuy's Aurora AQI map refreshes hourly with readings from {{source_name}} monitoring stations. For tomorrow's forecast, check AirNow or CDPHE's Front Range forecast.
Why Does Aurora's AQI Differ Between Apps?
Apps pull from different data and average it differently. AirNow's hourly NowCast leans on the most recent hours, while the official ozone AQI uses an 8-hour average and particle pollution uses a 24-hour average (AirNow). Sensor maps, including the City of Aurora's network, add neighborhood stations and model the gaps between them.
Glossary
Air Quality Index (AQI): The U.S. EPA's color-coded scale for daily air quality. It runs from 0 to 500.
PM2.5: Fine particulate matter 2.5 micrometers or smaller. Wildfire smoke is a major source. Learn more about PM2.5.
Ground-level ozone (O₃): A gas and the main ingredient in smog, formed when nitrogen oxides and volatile organic compounds (VOCs) react in sunlight.
MERV (Minimum Efficiency Reporting Value): The ASHRAE 52.2 rating, from 1 to 16, for how well an air filter captures particles. Higher MERV captures smaller particles. See Filterbuy's MERV rating chart.
HEPA: High-efficiency particulate air filtration used in portable air cleaners and sealed units, not in home HVAC filter slots.
CADR: Clean air delivery rate, a measure of how much filtered air a portable air cleaner puts out.
NowCast: AirNow's hourly AQI estimate, which gives the most weight to the latest hours of data.
Action Day Alert: A warning from the Colorado Department of Public Health and Environment (CDPHE) that ozone or particle pollution is, or soon will be, unhealthy along the Front Range.
Get Ready for Aurora's Next Bad-Air Day With Filterbuy
Filterbuy cuts every filter to order in its U.S. factories and ships it within 24 hours. Before fire season, choose MERV 13 in your size from 600+ options, with free shipping.
About the author: Michelle Wan is Filterbuy's Brand Manager and Air Quality Writer (B.A., University of California, Santa Cruz). She works directly with Filterbuy's U.S. manufacturing team, basing her guidance on how filters are built and used in real homes. Read more from Michelle Wan.
About the reviewer: David Clark is a Licensed HVAC Technician and President of Filterbuy HVAC Solutions. He is an EPA-certified technician and a graduate of the South Florida Academy of Air Conditioning.