Reducing PM2.5 and PM1.0: A Strategy Against Bacteria and Viruses

- The Importance of PM2.5 and PM1.0

Particles PM10, PM2.5, and PM1.0 refer to the size of airborne particulate matter, where the numbers indicate the diameter of the particles in micrometers. PM10 includes particles with a diameter of 10 micrometers or less, PM2.5 includes those with a diameter of 2.5 micrometers or less, and PM1.0 encompasses particles with a diameter of 1.0 micrometer or less. The size of these particles directly affects their ability to spread through the air and enter the human body.

Impact on Indoor Bacteria and Viruses:

• PM10 mainly consists of larger dust particles, such as pollen, dust, and some larger bacteria. These larger particles are more easily trapped by air filters and settle out of the air more quickly, making them less likely to penetrate deeply into the respiratory system.
• PM2.5 particles are smaller and can carry more harmful substances, including bacteria and viruses. These particles can penetrate deeper into the lungs and pose a greater threat to human health. Because of their smaller size, they can remain suspended in the air for longer periods, increasing the chance of human exposure.
• PM1.0 particles are the smallest of the three and can carry viruses and other microbes into the deepest parts of the lungs. Although there is less research on PM1.0, theoretically, their small size allows them to remain airborne for extended periods, providing a potential medium for the transmission of viruses and bacteria.


Reducing levels of PM2.5 and PM1.0 may be more critical in reducing the spread of indoor bacteria and viruses. These smaller particles not only can carry more harmful microbes but also remain suspended in the air longer and more easily penetrate the human respiratory system.
While reducing PM10 can also contribute to improved air quality and may reduce the quantity of some larger bacteria, reducing levels of PM2.5 and PM1.0 is more important for controlling the spread of viruses.

To effectively reduce the spread of indoor bacteria and viruses, focus should be on lowering levels of PM2.5 and PM1.0. This can be achieved through the use of high-efficiency air purifiers, regular replacement of air filters, and maintaining good indoor air circulation.

CurieJet® P700 Particle Sensor Module uses laser light with Mie scattering theory to measure PM2.5, PM10 and even PM1.0 particulate matter and dust in the air. It adopts our customized air pump, air chamber and MCU and is the world’s smallest optical laser PM 2.5 sensor with size only 29 x 29 x 4.9 mm. It is the smallest size in the world with only 1/4 volume of other optical laser PM2.5 sensors.