One of them is that the air is getting worse, but the detection point detects high-altitude air, and the concentration of pollutants has not gone up for the time being, while people breathe low-altitude air, which is getting worse, so this will happen.

Another possibility is that local pollution suddenly occurs around you, such as someone burning something. Because the air quality is updated every hour, and the location of the detection point is uncertain, you may be close to this pollution source, but when these pollution sources spread near the detection point, they will spread and be diluted, so the detected air quality is not bad, but you live near the pollution source, even if it spreads, it will take time for the source to get better, so you will feel choking.

Besides, it's 82, the quality is not as good as it is, and it's close to mild pollution, which really makes people feel a little uncomfortable. If it is below 70, there is generally no problem.