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How do PM2.5 and VOC sensors play an important role in real-time air quality monitoring

Update: 2021-05-28 10:45 Source: LUFTMY Reading: ↻ News

Two of the key indicators we use to monitor air quality for pollution are fine particulate matter (PM2.5) of 2.5 microns or smaller and volatile organic compounds (VOC).Burning fireplaces and candles, for example, releases these substances in interior Spaces.However, through the new technology of PM2.5 sensor and VOC sensor technology, the air quality can be monitored in real time, so as to help us improve the surrounding environment and improve our health.


We all know that fine particulate matter in the air can cause serious health problems. According to the World Health Organization (WHO), "stroke, heart disease, lung cancer and acute and chronic respiratory diseases can be reduced by improving air quality".No matter how big the particle size is, it is harmful to people, but the biggest impact is PM2.5, that is, dust diameter less than 2.5 microns of fine particles.These tiny PM2.5 particles can easily get deep into the lungs and cause serious health problems.

Luftmy LD09 laser PM2.5 sensor module

Official air quality monitoring stations mainly provide consolidated or average data on the outdoor environment, and do not contain corresponding indoor air quality data.Unable to generate personalized information, these stations only measure the average air quality near their location over time, so they lack real-time information to track the rapidly changing environment around us and monitor fluctuations in local PM levels.


With Lefmai's new PM2.5 sensing technology, PM2.5 sensing can now be integrated into mobile devices to understand PM values in real time.Users can view data and trends on air pollution levels in their area.For example, with smartphones, users can get timely, reliable and transparent air quality information so that they can take action and minimize their exposure to PM2.5 in accordance with WHO air quality guidelines to help improve people's health.


Conventional optical PM sensors rely on built-in fans to draw air through a measuring unit that records the amount of particulate matter, where particle counts are recorded and the concentration per unit volume calculated.The problem with this approach is that such PM sensors are relatively large, often about the size of a matchbox, and therefore cannot be used in flat, portable devices.


The unique PM sensor technology developed by Lefmaier requires only natural ambient air flow to deploy measurements.This novel approach enabled Lefmai to develop PM sensing solutions with a substantially reduced physical size, approximately 1/500th (0.2%) the volume of other solutions on the market.Its size has been reduced to the size of a match head, making the new technology ideal for personalised PM2.5 dust measurements in consumer devices.It has the advantages of low power consumption, free maintenance and high precision.


VOC detection


Another airborne problem is caused by VOCs, which are ubiquitous, diverse and prone to biochemical reactions.People typically spend 90% of their time indoors, so the concentration of VOCs in indoor ambient air can have a huge impact on our health.


VOC sensors detect a variety of gases inside and outside the building, including (hydrogen) carbon compounds (such as alcohol or CO), sulfides (which cause unpleasant odors, such as H2S), and solvents (such as acetone).They can come from paint, varnish or detergent.In the smart home, VOC information helps control a variety of devices, such as turning on and off the kitchen range hood or activating the air purifier.In addition, this information can be used to generate alarms, such as fire detection, or even to identify food spoilage in refrigerators.VOC data can also be used in conjunction with other Internet of Things (IoT) applications, such as optimizing ventilation in an office building based on air quality data.

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