The nature of such problems has changed: intense local smoke pollution has been largely reduced, whilst total emissions of pollutants and their dispersal over long distances have increased.

这个同题的性质也发生了变化：剧烈的局部烟雾污染已大为下降，而污染物的总量以及扩散距离却增加了。

youdao

Local Government Association Web site on asylum and voluntary dispersal.

BBC: Human Traffic

The Home Office has overall responsibility for co-ordinating the dispersal of refugees in the country, while local governments are asked to make spaces available.

ECONOMIST: Kosovar refugees