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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →For current U.S. air conditions, start with AirNow. To find nearby official monitors and review past readings, use the EPA’s Interactive Map of Air Quality Monitors and AirData. For detailed historical records, use EPA’s Air Quality System (AQS) files or API. The best source depends on whether you need a current estimate, a monitor’s location, a historical summary, or downloadable data—and every reading needs its pollutant, timestamp, location, and data status to be meaningful.
Choose the right source for your question
| What you need | Start here | What to know |
|---|---|---|
| Current conditions or a forecast | AirNow | Designed for public AQI information and forecasts. Map readings are preliminary and may change. |
| Official monitor locations and site details | EPA Interactive Map of Air Quality Monitors | Check the specific site and pollutant: a nearby monitor may not measure the pollutant you care about. |
| Past daily or annual summaries | EPA AirData reports and visualizations | Useful for daily and annual AQI or concentration summaries at city, county, or individual-site level. |
| Downloadable or detailed historical records | AQS pre-generated files or API | Files cover common data needs; API queries allow more control and require an API key. |
| Additional neighborhood-scale PM2.5 context | AirNow Fire and Smoke Map | May include community sensors. Treat these as supplemental observations, not interchangeable with official monitor measurements. |
Find official monitors near your neighborhood
Open the EPA monitor map and search or zoom to your area. Select nearby sites to see monitor-specific information, then check the pollutant layer and network before interpreting the dot as relevant to your question. The map covers monitors for CO, lead, NO2, ozone, PM10, PM2.5, and SO2, as well as specialized networks.
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- Open the EPA Interactive Map of Air Quality Monitors.
- Search for your city or zoom to the neighborhood.
- Inspect individual sites and confirm which pollutant or pollutants are measured there.
- Note the site location, reporting network, date, and time shown for the reading.
A monitor measures conditions at its own site. Distance alone does not establish that it represents every street in a neighborhood, and one site may not measure every pollutant. Compare site location, pollutant, and time—not just which marker appears closest.
Check current conditions with AirNow
Search your location on AirNow for a public-facing AQI view and forecasts. Use its map when you want to inspect individual sites or nearby observations. The map states: “All readings are preliminary, unvalidated, and subject to change.” Its “no data” status means nothing was reported for the most recent hour; it does not establish that the air was clean or that pollution was absent.
#1 Best Overall
- Know your air – An Alexa air quality monitor that makes it easy to understand what’s in your indoor air.
- Track and measure – Our indoor air quality monitor keeps tabs on 5 key factors: particulate matter (PM 2.5), volatile organic compounds (VOCs), carbon monoxide (CO), humidity, and temperature.
- Stay informed – Get an indication of current indoor air quality from the color-coded LED, and detailed information and an easy-to-understand air quality score in the Alexa app.
- Real-time alerts - Get notifications on your phone or announcements on Echo devices when Alexa detects poor indoor air quality.
- Automate climate control - Enable Routines to turn on or off your compatible Alexa devices, such as air purifiers, dehumidifiers, and fans, when the indoor air quality sensors detect changes.
AirNow reports AQI for the public. It says its measurements come from state, local, or tribal agencies using EPA-approved reference or equivalent methods. AQS, by contrast, is EPA’s system for data used in regulatory purposes. These systems serve different purposes, so check the source and status rather than assuming two displays are identical.
Look up historical readings in AirData or AQS
Use AirData for summaries and common downloads
EPA’s AirData provides reports and visualizations for daily and annual AQI or concentration summaries, including views by city, county, and monitor site. It also provides downloadable daily and annual files. Choose the geography and pollutant you need, then verify the dates and site before comparing results.
Rank #2
- 【16-in-1 Air Quality Monitor Indoor】Experience the ultimate indoor air quality monitoring with our 16-in-1 Air Quality Monitor, offering real-time detection of 9 key parameters including CO2, PM2.5, PM1.0, PM10, HCHO, TVOC, Temperature, Humidity, AQI, and Time. With 7 distinct AQI alert buzzers, this air quality tester ensures your family breathes with ease.(*Note: "16-in-1" refers to the combination of 9 key detectable parameters and 7 types of AQI alert buzzers.)
- 【Crystal Clear 7-inch Large Display】Enjoy a 7-inch LED display for sharp, clear air quality readings. Provides an instant, comprehensive view of your indoor air without navigating through menus, with three brightness settings for any lighting condition
- 【External High-Precision Sensors with 0.001 Accuracy】Equipped with advanced external high-precision sensors, this device delivers unmatched accuracy (0.001 units) by directly sampling the air. Its innovative multi-sensor array and enhanced airflow design detect even the slightest environmental changes, allowing for instant response and optimal safety. (*Note: Avoid touching the sensors or exposing them to perfumes/strong odors to maintain accuracy.)
- 【Real-Time AQI Alert Buzzers】Our air quality monitor provides real-time monitoring and alerts for pollutants like CO2, PM2.5, PM1.0, PM10, HCHO, TVOC, Temperature, Humidity, and AQI, with 7 distinct alert functions. Stay informed with clear alerts and rest easy with a mute button to silence alarms. Your health and comfort are our priority. Toggle between Fahrenheit and Celsius instantly with a double-press of the "Power" button on this air quality detector.
- 【Up to 8 Hours of Runtime & Flexible USB-C Charging】 Enjoy up to 8 hours of continuous air quality monitoring on a full charge. The USB-C charging interface offers flexible power options and is compatible with widely available USB-C cables, while the included AC adapter provides convenient charging at home. Designed for effortless monitoring wherever you need it—from bedrooms and living spaces to your car and beyond.
Use AQS for more detailed queries
For row-level historical data or more specific query control, use the AQS API or EPA’s pre-generated AQS files. API access requires a key. EPA explains that AirData uses AirNow data to supplement AQS for some recent AQI or daily-concentration displays, so the newest AirData values may not all have the same underlying source or status.
Account for reporting and validation delays
Regulatory data are not necessarily available in real time. EPA says reporting agencies have 90 days following the end of a calendar quarter to submit data to AQS and that the latest AQS data may be up to six months old at a given point in the year. Review the displayed dates before treating an empty or old historical series as evidence about current conditions.
Rank #3
- High Accuracy & Fast Refresh Data: With this smart sensor, the PM2.5 accuracy is ±15 µg/m³ while temperature and humidity accuracies are ±0.54°F and ±3%RH.The two-second correction data feature shows the latest changes in PM2.5, temperature, and humidity.Keep sensor clear for accurate detection.
- Multifunctional Air Quality Detector: The GoveeLife Air Quality Monitor conveniently measures 3 important indexes for indoor air quality, including PM2.5, temperature, and humidity.
- Switchable Display: Press the top button for the clock & PM2.5 display. Long press for 2 seconds to switch to bright screen mode & night mode. The LED indicator displays 4 levels of ambient air quality. 2.4G Wi-Fi is required to display the time.
- Connect with GoveeHome Appliances: Set your target air quality and link with your other GoveeHome smart appliances. GoveeLife air purifiers, humidifiers, and space heaters will turn on and off automatically when the indoor air quality changes.
- H5106 needs to be connected to a power source and supports GoveeLife devices: Smart Air Purifiers - H7126, H7120, H7124, H712C, H7122, H7123; Humidifiers - H7140; Fans - H7100, H7102
- If you need a current public reading, check AirNow rather than waiting for finalized AQS records.
- If an AQS result stops before the period you need, account for the submission and review lag.
- If recent regulatory data remain unavailable, contact the reporting agency for the monitor or area.
Use community sensors as supplementary context
During smoke events, the AirNow Fire and Smoke Map can provide additional neighborhood-scale PM2.5 observations where community sensors are available. EPA describes quality controls and a correction equation for PurpleAir data displayed on that map, and also notes limitations of low-cost sensors. A sensor value is not automatically a regulatory-grade measurement, and values from different maps may use different processing.
When comparing a community reading with an official monitor, record the sensor source, pollutant, timestamp, and any correction or quality-screening information shown. Consider the sensor’s surroundings and distance from the location of interest; do not treat a single nearby point as a complete measurement of neighborhood-wide exposure.
Rank #4
- 【16-In-1 Comprehensive Air Quality Tracking】
- 【Easy Single-Tap Operation with Adjustable Audio Prompt】
When no public monitor is close enough
An outdoor sensor is an option if you need readings at a particular site that public monitors do not cover. EPA siting guidance recommends choosing a location that represents the area of interest and avoiding obstructions that alter airflow. A reading at one chosen location still describes that site and should not be presented as an official regulatory measurement.
Quick Recap
A quick checklist for interpreting a reading
- Pollutant: Is it PM2.5, ozone, or another pollutant you are trying to understand?
- Time: When was the reading observed, and is it current, preliminary, or historical?
- Location: Where is the monitor or sensor, and how representative is that site of your street or neighborhood?
- Source and method: Is the value from an official monitor, a public AQI display, or a community sensor—and has it been corrected or validated?
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