I want to improve my indoor air. What is the best air quality monitor that detects VOCs and CO2?

If you want accurate CO₂ and VOC measurements, the biggest thing to look for isn't the brand—it's the sensor technology:

• CO₂: Get a monitor with a true NDIR (non-dispersive infrared) CO₂ sensor. Avoid monitors that only estimate "eCO₂" from VOC readings.
• VOCs: Most consumer monitors measure TVOCs (total volatile organic compounds) rather than identifying specific chemicals. They're excellent for spotting trends (paint fumes, cooking, cleaning products), but not for telling you exactly which VOC is present.

Best overall

• Airthings View Plus - $279.99 (Target)

This is the monitor I'd recommend for most homeowners because it combines:

• True NDIR CO₂
• PM2.5 particle sensor
• TVOC sensor
• Continuous radon monitoring
• Temperature, humidity, and pressure
• Excellent historical trends and app

It's expensive (around $300), but it's one of the few consumer monitors that covers nearly every important indoor air quality metric in a single device. It's also consistently recommended by independent reviewers and Consumer Reports.

Best value

If you don't need radon, the Qingping Air Monitor Gen 2 is one of the strongest values:

• True NDIR CO₂
• PM2.5 and PM10
• TVOC
• Temperature and humidity
• Bright touchscreen
• Apple HomeKit support

It costs roughly half as much as the Airthings while covering the measurements that matter most for everyday air quality.

Best if CO₂ is your main concern

The Aranet4 Home is widely regarded as one of the most accurate consumer CO₂ monitors. It doesn't measure VOCs or PM2.5, but if your goal is improving ventilation, sleep quality, or reducing "stuffy" rooms, it's excellent.

If you want to improve indoor air

The most useful measurements are:

1. CO₂ – tells you when ventilation is poor.

• Under 800 ppm: excellent
• 800–1,000 ppm: acceptable
• Above 1,000 ppm: open windows or increase fresh air.

2. PM2.5 – detects smoke, cooking, candles, wildfire smoke, dust.
3. TVOCs – spikes after cleaning products, new furniture, paint, fragrances, or cooking.
4. Humidity – ideally 40–60% to reduce mold risk and improve comfort.

One additional note: if you're concerned about carbon monoxide (CO), don't rely on an air quality monitor unless it's specifically certified for life safety. Use a dedicated CO alarm that meets the appropriate safety standard, since those are designed and certified to alert occupants to dangerous CO levels.

If you tell me your budget (for example, under $100, around $200, or no limit) and whether you use Apple HomeKit, Google Home, Alexa, or Home Assistant, I can narrow it down to the best option for your setup.

When looking for an indoor air quality monitor that accurately tracks both VOCs (Volatile Organic Compounds) and CO2 (Carbon Dioxide) , you want to make sure the device uses a true NDIR (Non-Dispersive Infrared) sensor for CO2 rather than a cheap estimated/calculated sensor.

The top-rated choices on the market balance sensor precision, app ecosystem, and clear readouts:

AirGradient One : Highlighted as a top pick by Wirecutter Reviews by New York Times , the AirGradient One Go to product viewer dialog for this item. is an open-source powerhouse. It features a true NDIR sensor for CO 2 CO sub 2 C O 2 , a Sensirion sensor for NOx NOx N O x and VOCs VOCs V O C s , and a Plantower sensor for particulates. It gives you raw, highly accurate data with no hidden subscription fees and great local smart home integration.

Airthings View Plus / Wave Plus: The Airthings Wave Plus Go to product viewer dialog for this item. is a premier consumer-grade monitor. It tracks CO 2 CO sub 2 C O 2 , TVOCs, radon, humidity, temperature, and air pressure. It runs on AA batteries (lasting over a year), connects via Bluetooth/Wi-Fi to a clean app, and features a simple wave-of-the-hand color-coded visual indicator.

IQAir AirVisual Pro : Considered a gold standard for data visualization , this unit features a brilliant screen that shows real-time indoor CO 2 CO sub 2 C O 2 and PM2.5 PM2.5 P M 2.5 alongside outdoor air quality data pulled from local stations. It's a bit pricier and focuses heavily on particulate and CO 2 CO sub 2 C O 2 tracking, making it ideal if you want a standalone screen that doesn't require pulling out your phone.

Temtop M100 2nd WiFi / M2000 Series : If you prefer a dedicated, highly responsive desktop monitor with a large touchscreen graph interface , Temtop units use dedicated professional-grade electrochemical and NDIR sensors for TVOCs, CO 2 CO sub 2 C O 2 , and particulate matter at a slightly more accessible price point than commercial units.

To help narrow down which one fits best, tell me:

• Do you want a standalone screen display , or are you fine checking everything via an app/smartphone?
• Are you looking to integrate it into a smart home system like Home Assistant, Apple HomeKit, or Alexa?

My top pick: Airthings View Plus

• Airthings View Plus - $279.99 (Target)

If you want one monitor to meaningfully improve indoor air, I’d buy the Airthings View Plus. It measures:

• CO₂ — using an NDIR sensor, useful for judging ventilation.
• VOCs — useful for spotting increases from cleaning products, paints, furniture, cooking, etc.
• PM2.5 — especially important for cooking and wildfire smoke.
• Radon — a major bonus if you want a more comprehensive picture of your home.
• Temperature, humidity and air pressure.

It also has Wi-Fi, an e-ink display, and an app with historical trends. Airthings itself confirms the seven measurements.

Best alternatives

The Qingping Air Monitor Gen 2 is particularly compelling if you don't care about radon: it's substantially cheaper while still giving you true NDIR CO₂, tVOC, PM2.5 and PM10 measurements.

The Aranet4 HOME is excellent if CO₂ is your main concern, but it doesn't detect VOCs, so I wouldn't choose it for your stated goal.

One important caveat about VOCs

Don't interpret a VOC number as "how toxic my air is." Consumer VOC sensors generally provide a useful trend, rather than identifying individual chemicals or giving a precise health-risk measurement. For example, a sudden VOC spike after using cleaning products is actionable—you can increase ventilation—but the number itself doesn't tell you which VOC caused it.

For your goal of improving indoor air, I'd prioritize CO₂ + PM2.5 + VOCs + humidity, with radon as a valuable extra. That's why the View Plus is my overall recommendation.

If you tell me your budget (e.g. under $100, $200, or $300) and whether you use Apple HomeKit/Alexa/Google Home, I can narrow it down to the best 1–2 choices.

Finding a reliable indoor air quality monitor that accurately measures both VOCs (Volatile Organic Compounds) and CO 2 CO sub 2𝐂𝐎𝟐 requires looking past cheap generic gadgets. Many budget devices use inferior chemical sensors for CO 2 CO sub 2 C O 2 that only estimate levels based on VOC readings rather than measuring actual carbon dioxide.

Top-performing monitors utilize true NDIR (non-dispersive infrared) sensors for CO 2 CO sub 2 C O 2 and reliable metal-oxide sensors for VOCs/TVOCs.

Top Recommendations for VOC and CO 2 CO sub 2 C O 2 Monitoring

• Why it’s great: Highly praised by testing authorities like The New York Times Wirecutter , the AirGradient One Go to product viewer dialog for this item. is open-source, highly accurate, and transparent with its data. It features a true NDIR sensor for CO 2 CO sub 2 C O 2 , a Sensirion sensor for VOCs/NOx, and particulate sensors. It is exceptionally reliable for tracking when a room needs ventilation.

• Best for: Data nerds and anyone wanting professional-grade accuracy without a commercial price tag.

• Why it’s great: Airthings makes some of the most polished consumer monitors on the market. The View Plus Go to product viewer dialog for this item. has a customizable screen and tracks particulate matter, CO 2 CO sub 2 C O 2 , VOCs, humidity, temperature, air pressure, and even radon. The Wave Plus Go to product viewer dialog for this item. offers a similar sensor suite in a smaller form factor without the display screen.

• Best for: Whole-home integration, sleek aesthetics, and battery-powered or plug-in flexibility with a great mobile app.

• Why it’s great: A long-standing gold standard in indoor air monitoring. It features a clear, standalone screen that shows both indoor readings and local outdoor air data simultaneously. It tracks accurate CO 2 CO sub 2 C O 2, PM 2.5 PM sub 2.5 P M 2.5 , temperature, and humidity.

• Best for: People who want an easy-to-read standalone desktop display that doesn't strictly rely on checking a smartphone app.

• Why it’s great: A more budget-friendly 6-in-1 option that provides real-time tracking for CO 2 CO sub 2 C O 2 , TVOCs, PM 2.5 PM sub 2.5 P M 2.5 , AQI, temperature, and humidity on a high-contrast E-ink display.

• Best for: A cost-effective, portable device with app connectivity and solid battery performance.

What to Look Out For

• True CO 2 CO sub 2𝐂𝐎𝟐 vs. "Estimated" CO 2 CO sub 2𝐂𝐎𝟐: Ensure the unit specifies an NDIR sensor for carbon dioxide. If a cheap monitor claims to measure CO 2 CO sub 2 C O 2 using only a VOC sensor, the CO 2 CO sub 2 C O 2 number is just a calculated guess.
• VOC/TVOC Interpretation: VOC sensors measure total volatile organic compounds (household cleaners, paints, cooking fumes, new furniture). They can fluctuate wildly, so look for a monitor with an app that tracks trends over time rather than panicking over momentary spikes.

To help narrow down the ideal choice, do you prefer a monitor with a built-in visual display screen to look at on a desk/wall, or are you strictly looking for app-based smartphone tracking ? Let me know if you also want to track radon or fine dust (PM 2.5 PM sub 2.5 P M 2.5).

When looking for an indoor air quality monitor that accurately detects both VOCs (Volatile Organic Compounds) and CO 2 CO sub 2𝐂𝐎𝟐 (Carbon Dioxide) , you want to ensure the device uses true NDIR (Non-Dispersive Infrared) sensors for CO 2 CO sub 2 C O 2 rather than cheap estimated/calculated alternatives.

The top-rated air quality monitors on the market balancing accuracy, features, and reliability for VOC and CO 2 CO sub 2 C O 2 tracking include:

Airthings View Plus (Best Overall & Most Comprehensive) — Tracks CO 2 CO sub 2 C O 2 , TVOCs, PM 2.5 PM sub 2.5 P M 2.5 , radon (a rare and vital feature), temperature, humidity, and air pressure. It features a customizable e-ink display, long battery life or USB power, and strong smart home integrations. Available on the Airthings Store.

AirGradient ONE (Best Open-Source / Accuracy-Focused) — Highly regarded by tech and testing publications for its transparent, open-source data. It utilizes professional-grade sensors (including an NDIR CO 2 CO sub 2 C O 2 sensor and Sensirion TVOC/NOx sensors), giving you crisp, highly reliable metrics on chemical vapors and ventilation. Available directly via AirGradient.

Qingping Air Monitor Gen 2 (Best Display & Value All-Rounder) — A gorgeous device featuring a crisp touchscreen display. It accurately tracks CO 2 CO sub 2 C O 2 (via NDIR), TVOCs, particulate matter (PM 2.5 PM sub 2.5 P M 2.5 / PM 10 PM sub 10 P M 1 0 ), temperature, and humidity. It is responsive, highly accurate, and works seamlessly with modern smart home setups.

Awair Element (Best User-Friendly App) — A stylish wooden-slat enclosed monitor that tracks CO 2 CO sub 2 C O 2 , VOCs, humidity, temperature, and dust (PM 2.5 PM sub 2.5 P M 2.5 ). It provides actionable, easy-to-understand recommendations via its clean mobile app to help clean up specific pollutant spikes.

To help narrow down which choice fits your space best, tell me:

• Do you prefer a device with a constant physical display screen or a discreet wall-mounted unit controlled via app?
• Are you looking to monitor a single room (like a bedroom or home office) or your entire house?

If you want one monitor that genuinely measures both CO₂ and VOCs, my top pick is the Airthings View Plus.

Airthings View Plus

$329.99

Why I’d choose it

• CO₂: uses a true NDIR sensor rather than estimating CO₂.
• VOCs: continuously tracks VOCs.
• PM2.5: extremely useful for cooking, candles, fireplaces, and wildfire smoke.
• Radon: a major bonus, especially if you have a basement or live in an area where radon is a concern.
• Also measures temperature, humidity, and pressure.
• Wi-Fi connectivity and an e-ink display let you see trends without constantly checking your phone.

The main downside is price—roughly $300–$330 currently.

Best alternatives

The Aranet4 HOME is excellent if CO₂ is your primary concern, but it doesn't measure VOCs, so I wouldn't choose it for your stated goal.

Airthings View Plus

$329.99

Temtop M10+

$129.99

Qingping Air Monitor Lite

$76.00

One important caveat: a consumer "VOC" reading is generally a TVOC/overall VOC index, not a precise measurement of individual chemicals such as formaldehyde or benzene. So I'd use the VOC number primarily to identify changes and sources—for example, whether cleaning products, cooking, new furniture, or fragrances cause a spike.

If your goal is actually improving the air, I'd prioritize a monitor that gives you CO₂ + PM2.5 + VOCs, because those three measurements can tell you whether you need more ventilation, filtration, or source reduction.

My pick: Airthings View Plus. If you tell me your budget (e.g. under $100, $200, or $300) and whether you want HomeKit/Alexa/Home Assistant, I can narrow it to the best choice for you.

If your goal is improving indoor air, I’d prioritize a monitor that measures:

• CO₂ (true sensor, preferably NDIR) → tells you about ventilation and stale air
• VOCs (volatile organic compounds) → detects pollution from cleaning products, paints, furniture off-gassing, cooking, fragrances, etc.
• PM2.5 → very useful for smoke, cooking particles, and outdoor pollution
• Humidity + temperature → affects comfort and mold risk

My top picks:

Airthings View Plus Radon and Indoor Air Quality Monitor

$329.99

Qingping Air Monitor 2

$149.99

Aranet4 Wireless Indoor Air Quality Monitor

$186.67

🥇 Best overall: Airthings View Plus Radon and Indoor Air Quality Monitor

Best choice for most homeowners

Measures:

• CO₂ ✅
• VOCs ✅
• PM2.5 ✅
• Radon ✅
• Temperature/humidity ✅

Why I like it:

• Gives you the broadest picture of what is happening in your home
• Excellent for bedrooms, living rooms, basements, and homes where you want long-term trends
• Battery-powered with an e-ink display and app history

Downside:

• Around the premium price range (~$300+)

Buy this if: you want one device to guide real improvements (ventilation, filtration, identifying pollution sources).

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🥈 Best value: Qingping Air Monitor 2

Best bang for the buck

Measures:

• CO₂ ✅
• tVOC ✅
• PM2.5/PM10 ✅
• Temperature/humidity ✅

Why it’s appealing:

• Big color screen
• Covers the key metrics most people need
• Much cheaper than premium monitors

Downside:

• Less established ecosystem and fewer advanced integrations than Airthings

Buy this if: you want good data without spending $300.

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🥉 Best CO₂ accuracy: Aranet4 Wireless Indoor Air Quality Monitor

Best for bedrooms and offices

Measures:

• CO₂ ✅ (excellent)
• Temperature/humidity ✅

Why it’s popular:

• Extremely good CO₂ tracking
• Portable
• Long battery life

Downside:

• No VOC sensor, so it cannot tell you about chemical pollutants.

Buy this if: your main problem is stuffy rooms, poor sleep, or wanting to know when to open windows.

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What I would choose:

• Whole-home health monitoring: Airthings View Plus
• Best value: Qingping Air Monitor 2
• Bedroom/home office ventilation: Aranet4 + a separate VOC/PM monitor if needed

A few buying tips:

• Avoid cheap “10-in-1” monitors that claim to measure everything; many use questionable sensors or estimates.
• For CO₂, look for NDIR sensing rather than “eCO₂” estimates.
• Place the monitor where people spend time (bedroom, office, family room), not next to windows, vents, or air purifiers.

If you tell me your budget, home type (apartment/house), and whether you have gas cooking, pets, allergies, or a basement, I can narrow it to one model.

The Airthings View Plus Go to product viewer dialog for this item. is the best overall consumer-grade indoor air quality monitor that accurately tracks both CO2 (using a true NDIR sensor) and VOCs (Total Volatile Organic Compounds).

Top-performing options stand out for specific needs:

Best Overall. Tracks CO2, TVOCs, PM2.5, radon, temperature, humidity, and air pressure. It features a customizable E-ink display, long battery life or USB power, and robust smart-home integrations (Alexa, Google Assistant, IFTTT).

Best for Open Data/Accuracy. Highly praised by testers like Wirecutter , it tracks CO2, TVOCs, NOx, and fine particulates with an open-access web dashboard and modular design. Available fully assembled or as a DIY kit.

Best Mid-Range/Visual Display. Provides crisp local graphs and accurate tracking for CO2, TVOCs, and particulate matter with great app support.

A Quick Tip on VOC Monitors

Consumer monitors measure TVOCs (Total VOCs) as a relative index rather than pinpointing individual dangerous chemicals. Keep in mind that everyday items like cooking fumes, perfumes, and even human breath can cause TVOC spikes, so use the data as a general trend line to know when to ventilate or run a purifier with an activated carbon filter.

If you'd like to narrow this down, let me know:

• Is your primary concern general ventilation/stuffy air (CO2) or chemical off-gassing/odors (VOCs)?
• Do you prefer a device with a constant physical screen or a smart-app/battery-operated setup?

The best all-around indoor air quality monitors that accurately detect both VOCs (Volatile Organic Compounds) and CO2 (Carbon Dioxide) include the [Airthings View Plus Go to product viewer dialog for this item. ](https://www.airthings.com/view-plus) ($330), the AirGradient ONE Go to product viewer dialog for this item. ($200), and the Qingping Air Quality Monitor Gen 2 Go to product viewer dialog for this item. (~$150–$200). These devices use reliable NDIR sensors for true CO2 tracking alongside particulate and chemical sensors, providing robust mobile app integration and trend analysis.

Top Air Quality Monitors Compiling VOC and CO2 Data

Important Nuances on VOC and CO2 Sensors

• CO2 Measurement: High-tier consumer monitors use NDIR (Non-Dispersive Infrared) sensors for CO2, which give accurate, true parts-per-million (ppm) readings to let you know when a room needs ventilation.
• VOC Measurement: Most consumer-grade monitors track TVOCs (Total VOCs) via metal-oxide semiconductor (MOS) sensors. These are great for spotting relative trends (like when using cleaning supplies, painting, or cooking), but they do not isolate specific chemicals or give absolute chemical mass accuracy the way expensive lab photoionization detectors (PIDs) do.

If you want to narrow down your choice, let me know:

• What is your budget range?
• Do you need a unit with a physical screen or is an app-only display okay?

If your goal is meaningful indoor-air improvement, my top pick is the Airthings View Plus. It measures CO₂, VOCs, PM2.5, radon, temperature, humidity, and pressure—so you get much more useful information than just VOC + CO₂.

Airthings View Plus

$329.99

Why I’d choose it

• CO₂: Uses an NDIR sensor, with a 400–5,000 ppm range. This is particularly useful for figuring out whether your home needs more ventilation.
• VOCs: Tracks total VOCs continuously, which can help identify spikes from cleaning products, cooking, paint, furnishings, etc.
• PM2.5: Very important if you're concerned about cooking particles, candles, dust, or wildfire smoke.
• Radon: A major bonus—especially because radon isn't something you can detect by smell.
• Wi-Fi + app: You can see trends over days/weeks rather than just looking at a number occasionally.
• No outlet required: It can run on AA batteries, which makes placement easier.

Two alternatives worth considering

Temtop M10+

$129.99

Temtop M10+ — best value. Around $130 currently, and it measures CO₂, VOCs, PM2.5, temperature and humidity, with app connectivity. It's a good choice if you don't care about radon or want to spend less.

IQAir AirVisual Pro

$329.99

IQAir AirVisual Pro — best for PM2.5/CO₂. It's an excellent monitor with a very good display and strong particulate monitoring, but it does not measure VOCs, so I wouldn't choose it for your specific requirement.

One important caveat about VOC readings

Don't treat a consumer VOC number like a laboratory measurement of specific chemicals. Most home monitors report TVOC or a VOC index, rather than telling you which VOC is present or its concentration with laboratory-grade accuracy. CO₂ and PM2.5 readings are generally more actionable for day-to-day decisions. Community experience also suggests that some VOC sensors can be affected by temperature/humidity and can produce unexpectedly high readings.

My recommendation: If you're willing to spend ~$300, get the Airthings View Plus. It gives you the best overall picture of what's happening inside your house and, importantly, can tell you whether your air-quality improvements are actually working.

If you tell me your budget (e.g. <$100, <$200, or <$350) and whether you want Apple HomeKit/Alexa/Google integration, I can narrow it down to the best 2–3 choices.