Indoor Air Quality Monitors (PM2.5, CO2 and TVOC)

Indoor air quality monitors track PM2.5, CO2, and TVOCs, offering real-time data to improve your indoor air quality. Crucial in polluted countries like Thailand.

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skyline of bangkok choked by air pollution

Air quality monitors: Why are they important?

Air pollution in Thailand is a growing concern. Much of it is invisible—you can’t see it, smell it, or feel it. Yet according to Greenpeace, air pollution contributed to approximately 29,000 deaths in Thailand in 2021. This raises an important question: Do you really need an air quality monitor if your air purifier already has a sensor?
The answer is yes. While many air purifiers come with built-in sensors, they are often less accurate than a dedicated air quality monitor. Built-in components are typically designed to control fan speed, not to provide detailed air quality data. On the other hand, standalone indoor air quality monitors help make the invisible visible, offering real-time data and helping you better understand what you’re breathing in every day.

How to find the right air quality sensor?

The market is flooded with sensors, but not all air quality sensors are created equal. Many low-cost options use infrared beams, which are prone to inaccurate readings due to sensitivity to temperature and humidity. These can still be useful for general trends but shouldn’t be fully trusted for health-critical decisions.
For greater precision, choose a device that uses laser diffraction technology. These types of air pollution sensors are far more reliable and provide detailed data based on how particles scatter laser light. Your choice ultimately depends on how concerned you are. For rough readings, a basic pollution sensor might be enough. For health-conscious individuals, investing in a quality indoor air quality monitor is worth it.

qingping lite air quality monitor on a black table on black background
a human hand holding an air quality monitor next to a built in sensor of an air purifier

Do air quality monitors detect all kinds of air pollution?

The short answer: no. There are many different pollutants in the air, such as PM2.5, PM10, CO2, CO, NO2, SO2, O3, TVOCs, Radon, and Lead. A single device usually can’t detect all of them. However, most air quality monitors are designed to detect the most critical threats like PM2.5, CO2, and TVOCs.
In Thailand, PM2.5 is the most urgent concern, especially in cities like Bangkok and Chiang Mai, which frequently rank among the world’s most polluted cities during the dry season. CO2 buildup is also a growing issue, especially indoors where windows are rarely opened, and air conditioners are running all day.

How long do air quality monitors typically last?

A good air quality monitor is designed to last for hundreds or even thousands of hours. However, sensor performance can degrade over time. Dust can accumulate and clog the PM 2.5 detector, leading to inaccurate readings. Fortunately, high-end monitors like the Qingping Pro+ offer replaceable sensors and alert users when maintenance is needed. With proper care, you can extend the lifespan and keep your monitor functioning accurately for years.

the qingping pro plus on a wooden desk
an air purifier in a bedroom next to an air quality monitor showing high levels of indoor air pollution

How do PM2.5 sensors work?

PM2.5 sensors detect microscopic particles less than 2.5 microns in diameter—small enough to reach deep into your lungs. Budget-friendly monitors often use infrared light, which can be affected by environmental factors like humidity. In contrast, advanced PM2 5 sensors use laser diffraction to track how particles scatter light. This results in more precise data, giving users a clearer picture of indoor and outdoor pollution levels.

How do CO2 sensors work?

CO2 sensors commonly use NDIR (Non-Dispersive Infrared) technology. These sensors detect carbon dioxide by measuring how much infrared light is absorbed by the gas. NDIR sensors are highly accurate, long-lasting, and are a top choice for any reliable indoor air quality monitor.

a gif animation of an air quality monitor next to a white wine

How do VOC sensors work?

VOC (Volatile Organic Compound) sensors track chemical pollutants released from paints, cleaning products, candles, or even food. These sensors often use metal-oxide-semiconductor technology, which alters electrical resistance in response to VOCs. However, be aware: some air quality monitors might give false positives. For instance, the scent of a glass of wine or strong perfume can trigger the VOC sensor. Despite this, they’re still helpful for indicating trends in chemical exposure.

What’s the difference between indoor and outdoor monitors?

An indoor air quality monitor is optimized to detect pollutants commonly found inside buildings, like CO2, PM2.5, and VOCs. These pollutants come from sources like cooking, poor ventilation, and household products. Meanwhile, outdoor monitors are built to withstand the elements and focus more on ozone, nitrogen dioxide, and particulate matter.
Using both types of monitors allows you to see how outdoor conditions affect indoor air quality. For example, during high PM2.5 days, opening your windows might worsen indoor air. Monitoring both environments gives you the data you need to make informed choices.

outdoor air pollution monitor fixed on a railing

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