You're welcome! That number comes from the WHO: https://www.who.int/airpollution/ambient/health-impacts/en/ https://www.who.int/airpollution/ambient/health-imp

You're welcome! That number comes from the WHO: https://www.who.int/airpollution/ambient/health-impacts/en/ https://www.who.int/airpollution/ambient/health-impacts/en/