14:06Newshour29/08/2023 13:06 GMT: Air pollution now the greatest external threat to human healthBBC World Service Duration: 50 minutes Tue 29th Aug 2023, 14:06 on BBC World Service East and Southern AfricaIndia, Pakistan and China are some of the worst hit countries Show more GenresNewsFormatsMagazines & ReviewsBrandNewshour Source: BBC Online