Air pollution is harmful to the human body, especially in Taiwan by the haze in mainland China, the fall and winter northeast monsoon south, the sky is always gray and misty, if you don't have proper protection, the body will have an impact on all systems; therefore, the Environmental Protection Agency has also announced an amendment to the "serious deterioration of air quality emergency prevention measures", when the fine suspended particles of PM2.5 up to 350 micrograms, prohibit motorcycle on the road, and prohibit the hosting of road races, ballgames, and other outdoor sports. PM2.5 is known as particulate matter (PM2.5).