Calexico-Ethel Street, Imperial, California PM2.5 (fine particulate matter) AQI is 34 - Calexico-Ethel Street, Imperial, California PM10 (respirable particulate matter) AQI is 50 - Calexico-Ethel Street, Imperial, California NO2 (nitrogen dioxide) AQI is 15 - Calexico-Ethel Street, Imperial, California SO2 (sulfur dioxide) AQI is 2 - Calexico-Ethel Street, Imperial, California O3 (ozone) AQI is 15 - Calexico-Ethel Street, Imperial, California CO (carbon monoxide) AQI is 3 -