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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Their implementation will help to build and strengthen effective mechanisms for outbreak alert and response at national and international levels.

实施这些条例将有助于在国家和国际层面上建设和加强有效的疾病暴发预警和应对机制。

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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.

BBC: China IP address link to South Korea cyber-attack

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

FORBES: News Wrap: Russia & China Reports on Japan Quake

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

BBC: Environment apologise made over Wendlebury flooding