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Beijing 's average aqi was 145 in 2012 compared with 151 in 2011 and 160 in 2010 .

2012年北京平均空气质量指数是145，2011年和2010年分别为151和160。

He said he was surprised after analyzing the data to find that both average aqi and pm2.5 levels in beijing have gradually improved every year since 2010 .

伊斯维说，他在分析数据之后吃惊地发现，从2010年以来，北京的空气质量指数和pm2.5水平实际上每年都在逐步改善。

However , comparing average aqi levels by month may not be the best way to analyze the trend , says steven q. andrews , a beijing-based environmental consultant who has studied beijing 's air pollution for six years .

但北京环境咨询师、研究北京空气污染问题已达六年的安雪峰（stevenq.andrews）说，逐月比较平均空气质量指数并不是分析趋势的最佳办法。

A deputy to gen. david petraeus , the commander of us forces in iraq , briefed reporters on an emerging profile of recruits to the terrorist organization al qaeda in iraq ( aqi ) that his command had compiled from interviews with aqi detainees .

一名副手戴维彼得雷乌斯将军，指挥官，美军在伊拉克，向记者介绍了一个新兴的概况，招募到的恐怖组织盖达组织在伊拉克（农业检疫及检验）表示，他的指挥已编制从访谈与农业检疫及检验被拘留者。

First , it 's important to understand exactly what aqi measures in the chart above : the weight of solid particles smaller than 2.5 micrometers wide ( commonly known as fine particulates ) that are suspended in an average cubic meter of air .

首先，很重要的一点就是我们需要知道在上面这个图表中，aqi数值究竟测量的是什么：它指代的是在一立方米空气中所含有的小于2.5微米的所有固体颗粒（也就是所谓的微颗粒）的重量。