The Airparif monitoring agency said smog density was still near alert levels Monday, but rain forecast for Tuesday was expected to clear the air.

空气监测机构表示，周一雾霾浓度仍然处于警戒水平，但是预计周二的降雨能够净化空气。

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Similarly, tests with multiple stages can be classified into the three OOT alert levels, but this task is much more challenging and less straightforward.

同样，多阶段检测也可分为三种OOT警戒水平，但是这项任务太具有挑战性，不是那么简单。

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Following Wednesday's attack, the KCC raised its cyber-attack alert levels to "caution, " the third highest out of five levels.

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In Russia, authorities are on high alert monitoring radiation levels along the shore.

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The agency confirmed that both the flood alert and flood warning levels been breached overnight.

BBC: Environment apologise made over Wendlebury flooding