PM2.5, as a fine particulate matter with a diameter of less than 2.5 microns, has become the focus of attention because it can enter the human lungs and blood, causing serious harm to human health.

Using PM2.5 sensors to monitor indoor air quality allows us to intuitively understand the indoor PM2.5 concentration. So, what PM2.5 value is considered a normal range?

According to the World Health Organization (WHO) and relevant national standards, the normal range of indoor PM2.5 concentration is usually defined as the concentration of PM2.5 particulate matter in per cubic meter of air within a specific range. In general, here are some common PM2.5 concentration standards:

● Excellent Air Quality: PM2.5 concentration is in the range of 0-12 μg/m³. At this time, the air is fresh and has no obvious impact on health.

● Good Air Quality: PM2.5 concentration is in the range of 12-35 μg/m³. At this time, the air quality is good and has little impact on the health of most people.

● Light Pollution: PM2.5 concentration is in the range of 35-55 μg/m³. At this time, the air quality is average, and it may have slight health effects on a few sensitive people.

● Moderate Pollution: PM2.5 concentration is in the range of 55-150 μg/m³. At this time, the air quality is poor, which can easily lead to health problems for sensitive groups.

● Heavy Pollution: PM2.5 concentration exceeds 150 μg/m³. At this time, the air quality is extremely poor, which will have a serious impact on the health of all people, and effective air purification measures need to be taken.

According to the above standards, when the indoor PM2.5 concentration is within the excellent or good range, the air quality is better and the impact on health is smaller; when the concentration exceeds a certain range, it is necessary to be alert to potential health risks and take timely measures to improve the indoor environment.

Monitoring indoor PM2.5 status with PM2.5 sensors is one of the effective means to guarantee indoor air quality. Understanding the normal range of indoor PM2.5 concentration helps to discover air quality problems in time and take corresponding measures to protect people's health. Therefore, it is recommended to set up PM2.5 sensors indoors and take corresponding air purification measures according to the monitoring results to create a healthier and more comfortable indoor environment.