11.   Last month, thick smog shrouded the Iranian capital and forced many airline flights to be canceled.

12.   Radio stations urged mothers to keep infants indoors, and the sick and elderly not to step outside to avoid breathing in the thick smog.

13.   Relief came in late November, when the rainy season started and chased away the thick smog that had been hanging over many parts of Kalimantan and Sumatra.

14.   Roslee said investigators had yet to determine whether the thick smog that has shrouded the region was to blame.

15.   The plane slammed into a jungle slope while trying to land in a thick smog.

16.   The plane crashed into a jungle slope while descending to land in a thick smog caused by forest fires.

17.   The plane crashed into a jungle slope while trying to land in a thick smog.

18.   The three countries were the worst affected by thick smog which blanketed the region last year.

19.   They produced thick smog across a large slice of Southeast Asia, threatening the health of millions.

20.   Thick smog shrouded the Iranian capital Sunday, forcing cancellation of flights and radio stations to call for people to stay indoors.