In discussions about air quality, we often focus on outdoor air pollution, such as the impact of industrial emissions and vehicle exhaust on PM2.5 (fine particulate matter) levels. However, in recent years, multiple studies using PM2.5 sensors for monitoring have found that, in many cases, indoor PM2.5 concentrations are actually higher than those outdoors. This finding has not only attracted widespread public attention but also posed new challenges to our understanding of indoor air quality.

Reasons for elevated indoor PM2.5 concentrations:

● Cooking and Smoking: Indoor cooking processes, especially frying and stir-frying, produce a large amount of PM2.5. Similarly, smoking releases significant amounts of fine particulate matter into indoor spaces.

● Poor Ventilation: If indoor spaces lack effective ventilation, PM2.5 particles accumulate in the air, leading to increased concentrations.

● Emissions from Household Products: Some furniture and building materials, as well as cleaning supplies, may release volatile organic compounds (VOCs), which can be converted into PM2.5.

● Infiltration of External Pollutants: Even PM2.5 from outdoor sources can penetrate indoors through gaps in doors and windows, especially on days with severe air pollution.

In these studies, PM2.5 sensors have played a key role. These sensors can monitor PM2.5 concentrations in real-time, helping researchers analyze and compare air quality in different environments. Through this data, we can better understand the severity and characteristics of indoor air pollution.

Suggestions for improving indoor air quality:

● Enhance Ventilation: Improve indoor air circulation by opening windows or using air purification systems.

● Use Air Purifiers: Choose air purifiers with HEPA filters, which can efficiently capture PM2.5 particles.

● Control Cooking Pollution: Use range hoods and other kitchen exhaust equipment to reduce the generation of PM2.5 during cooking.

● Choose Low-Emission Furniture: Purchase furniture and renovation materials with low VOC emissions to reduce indoor pollution sources.

● Regular Cleaning: Reduce the accumulation of indoor dust and fine particles through cleaning.

Through these measures, we can not only reduce indoor PM2.5 concentrations but also contribute to the overall health of the living environment. Remember, protecting indoor air quality is one of the important steps each of us can take for our own and our family's health.