Actually, that 3.8 million is separate from the 4.2 million caused by outdoor air pollution: https://www.who.int/news-room/fact-sheets/detail/ambient-(outdoor)

Actually, that 3.8 million is separate from the 4.2 million caused by outdoor air pollution: https://www.who.int/news-room/fact-sheets/detail/ambient-(outdoor)-air-quality-and-health https://www.who.int/news-room/fact-sheets/detail/ambient-(ou...