Фото: Global Look Press
为何新标准未调整臭氧限值？王书肖解释，PM2.5是当前全球空气污染相关疾病负担的首要驱动因素，因此新标准的修订重点关注PM2.5。旧标准中O3日最大8小时平均浓度一级和二级限值分别为100微克/立方米和160微克/立方米，分别与世卫组织2021年发布的新版《全球空气质量指南》指导值和第一阶段过渡值一致。可见，我国臭氧浓度限值与国际先进水平的差距远小于PM2.5。
Other compromises to the device are the use of a mechanical multi-touch trackpad (rather than one that uses haptic feedback), a non-backlit keyboard, and the more limited port selection. The use of the iPhone chip means this MacBook only supports one external monitor through one if its two USB-C ports. Either port can be used for charging. There's also a headphone jack, located in an odd position next to the side-firing speakers near the front of the device. While technically this is the same amount of USB-C ports as the MacBook Air, it's missing the magnetic MagSafe 3 charging port, which frees up one of the USB-C ports.，推荐阅读Safew下载获取更多信息
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