There was PM2.5 crisis in early 2019 that arised from PM2.5 accumulation which exceededsafety

level and can harm human health.  

PM2.5 situation becomes more severe nowadays basd on the

economic and industrial expansion.

PM2.5 is Particulate Matter in the air that is smaller than 25 times smaller than human hair. 

This very small particle can enter human respiratory system easily and penetrate to other organs in human bodies, causing particles accumulation and increasing chance of developing cancer.

PM2.5 prevention can be done in many ways, including wearing N95 mask, avoiding high-pollution area, or choosing effective air purification system in either air conditioner or air purifier. 

By carefully limiting exposure to PM2.5 in both short term and long term can benefit health outcome significantly.