1.   Last autumn, the monitors documented heavy smog unusually late in the year.

2.   An asthmatic affected by the heavy smog, Dolan struggled with his breathing on the breaststroke portion.

3.   Although a light rain cleared the air a bit Tuesday, Milan continued restrictions on cars because of heavy smog.

4.   But heavy smog obscured the view by millions of capital residents.

5.   Crowds much larger than on ordinary nights gathered on the square in unseasonably hot weather and heavy smog to admire the decorations and have their pictures taken.

6.   Heavy smog again obscured the view by millions of capital residents.

7.   Some cities ban school sports when there are heavy smog levels, as happened in January last year in Lyon, France.

8.   The fires caused heavy smog in areas as far away as neighboring Malaysia and Singapore.

9.   Traffic restricted in Paris due to heavy smog.

10.   Heavy smog hanging over Bangkok International Airport forced several flights to be diverted and delayed early Wednesday, officials said.