A big upgrade is coming to our favorite iPad. The iPad Air, Apple's best blend of performance and price, now comes with the M4 chip. This announcement comes ahead of a "special Apple experience" scheduled for 9 a.m. ET on Wednesday, March 4. Apple CEO Tim Cook teased the experience on social media, and he also referred to a Monday, March 2 announcement.
对比新旧文件可以看到，新标准收严了PM2.5、PM10、SO2、NO2等污染物的限值，但没有调整臭氧的限值。
，这一点在PDF资料中也有详细论述
▲图片来源：X@TehranTimes79
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