83d3eaef__PM2_5_Air_Quality_Index__AQI___Health_Implications
[AQI] 201-300 [Air Pollution Level] Very Unhealthy [Health Implications] 
Health warnings of emergency conditions. The entire population is more likely to be affected.
Yashio, Shinagawa, Tokyo, Japan Air Pollution: Real-time PM2.5 Air Quality Index (AQI)
Health Implications