Select the reasons why you think the WHO says that indoor pollution is the worst type of pollution globally. Select all that apply.
a.Indoor pollutants quickly reach high concentrations in a smaller area.
b.Pollutants disperse more readily than they do outside.
c.Pollutants do not readily disperse like they do outside.
d.People also stay inside longer than they stay outside.
e.Indoor pollutants do not reach high concentrations in a smaller area.