Ozone (O3)

臭氧（O3）

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This uses the compiler flags -O, -O2, -O3, where each level of optimization applies higher levels of optimization techniques to squeeze more and more performance.

这使用编译器标志 -O、-O2、-O3（优化级别依次增高）来进一步挖掘性能潜力。

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They recommend revised limits for the concentration of selected air pollutants: particulate matter (PM), ozone (O3), nitrogen dioxide (NO2) and sulfur dioxide (SO2), applicable across all WHO regions.

它们为下述选定的空气污染物的浓度限值提出了修订：可吸入颗粒物(PM)、臭氧(o3)、二氧化氮(NO2)和二氧化硫(SO2)，适用于世卫组织所有区域。

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The greenhouse gases surveyed include not only carbon dioxide but also methane (CH4), nitrous oxide (N2O), ozone (O3), and fluoride-containing gases that contribute to climate change.

FORBES: EPA Greenhouse Gas Inventory Shows 6 Percent Drop In CO2

Summer months are generally worse for O3.

BBC: London's clue to stubborn ozone levels