I apologize for any confusion. You are correct that according to Chinese AQI standards, any level of 100 or less is considered acceptable. However, the WHO guideline I mentioned earlier is based on a 24-hour exposure limit for PM2.5 particulate matter, which is a more conservative standard than the AQI. It is important to note that the AQI takes into account multiple air pollutants, not just PM2.5, and different countries may have different AQI thresholds for when it is safe to go without a mask. It is always a good idea to monitor local air quality conditions and follow the guidance of local health authorities regarding mask use.
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