La Serena PM2.5 (fine particulate matter) AQI is 42 - La Serena PM10 (respirable particulate matter) AQI is 38 - La Serena NO2 (nitrogen dioxide) AQI is n/a - La Serena SO2 (sulfur dioxide) AQI is n/a - La Serena O3 (ozone) AQI is n/a - La Serena CO (carbon monoxide) AQI is n/a -