Fine particulate matter, or PM2.5, refers to particles with a diameter of 2.5 microns or less. Due to their tiny size, they can penetrate deep into the lungs and even enter the blood system, posing a serious threat to human health. In indoor environments, major sources of PM2.5 include cooking smoke, tobacco smoke, the use of certain cleaning products, burning items, and the infiltration of outdoor air. Understanding and controlling indoor PM2.5 levels is an important health consideration for every home and office environment.

To know if indoor PM2.5 exceeds the limit, the primary tool is the PM2.5 sensor. These sensors can measure and record PM2.5 levels in the air in real-time, providing users with accurate air quality data. Currently, commercially available air quality monitors often include a PM2.5 sensor, which can conveniently display information via a screen or push data to smart devices through networking functions, allowing users to understand indoor air conditions at any time.

When PM2.5 is detected to exceed the limit, taking immediate action is crucial. To address this issue, consider the following strategies:

1. Use an air purifier: Efficient air purifiers can filter indoor PM2.5, especially those with HEPA filters, which can effectively remove fine particulate matter from the air. Ensure regular filter replacement to maintain the cleaning efficiency of the air purifier.

2. Improve indoor ventilation: When outdoor air quality is good, increase the circulation of indoor and outdoor air by opening windows and using exhaust fans, which can dilute and discharge indoor pollutants.

3. Reduce indoor pollution sources: Use a range hood when cooking, avoid indoor smoking, and choose furniture and decoration materials with no or low VOC emissions. These suggestions can reduce the generation of PM2.5 at the source.

4. Indoor vegetation: Certain indoor plants can absorb pollutants from the air. Although their effect on removing PM2.5 is limited, they are somewhat helpful in improving indoor air quality.

5. Regular cleaning: Regularly using a vacuum cleaner with HEPA filtration to clean carpets, floors, and dust on walls can reduce the amount of indoor particulate matter.

In summary, by using a PM2.5 sensor for real-time monitoring of indoor air quality and taking a series of effective measures, the level of indoor PM2.5 can be significantly reduced, creating a healthier and more comfortable living and working environment. This is vital for everyone's healthy life.