Methods 1%yekang cockroach gel bait and 0.5% Permanone smoke fog were used for chemical control. Adhesive killing method was applied in density investigation.

方法采用1%晔康杀蟑胶饵和0.5%氯菊酯的烟雾剂，密度监测采用粘捕法。

youdao

Smoke began to spread across the freeway like fog.

烟开始像浓雾一样在高速公路上蔓延。

youdao

youdao

Officers are examining whether fog or smoke from a nearby bonfire and fireworks event may have been a factor.

BBC: M5 crash: Retired couple from Newport among victims

Tuzla is a dismal compound of valley fog and wood smoke -- and its people are not in the mood to celebrate the peace agreement.

CNN: Bosnian city gets ready for NATO peacekeepers

The image is grainy, but good enough to be able to fly at very low level at night, although rain, fog, or smoke adversely affect it.

BBC: News | In Depth | Military Fact Files