What steps is his department taking to quantify and mitigate the disproportionate health impacts outlined in the findings of the most recent Global Burden of Disease Study 2016 of the Institute for Health Metrics and Evaluation, which estimates that in South Africa, ambient or outdoor and indoor or household air pollution cause 20, 160 and 6,934 annual deaths respectively, with health impacts being largest among children under the age of five, women, older people and the poor? (NW2890E)