Beijing experienced serious smog on last Saturday despite showers vpn软件免费 over past two nights, the Beijing Environmental Protection Monitoring Center said.

The Air Quality Index (AQI) reading was 229 at 6 p.m. last Saturday, 免费vpn meaning serious pollution, with the major pollutant being PM2.5, particulate vpn免费 matter measuring less than 2.5 microns in diameter, said the center.

The engineer from the vpn免费 center forecast that the smog would persist until Monday night when a cold snap will arrive. The density of PM2.5 in Beijing decreased by 12.5 percent year on year in January to August, according to the vpn软件免费 Beijing Environmental Protection Bureau.

北京环保监测中心指出，上周六虽然下了两夜的雨，但北京仍然经历了严重的雾霾。

监测中心称，空气质量指数上周六下午6点的数值为229，意味着严重的污染，主要污染物为PM2.5，即直径小于2.5微米的颗粒物。

中心工程师预测雾霾将会持续要本周一寒流来袭。北京环保局表示，北京1至8月份PM2.5的浓度与去年相比降低了12.5%。



【讲解】

文中的Air Quality Index就是“空气质量指数”的意思，其中index用作名词，意为“指数”，常见的词汇搭配如：author index（作者索引）、price index（物价指数）、index vpn免费下载 number（指数）。

第三段中的短语cold snap意为“寒流”，如：We had a serious cold snap last year that damaged the fruit 免费vpn vpn免费下载 crop.（去年我们经历了一场严重的寒流，使我们的果物产量遭到损失。）

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