Wildly high PM25 values from api

i’ve noticed this for the past several weeks and finally put some logging in to catch it. I’m got dozens of these from just today. pm25 value is over 2000 and sometimes much higher. no way this is correct right? i’ve put some code in on my side to just catch these and set the value i show to at least a more plausible number (300). any ideas?

sensor=206005 sensor_index=206005 pm2.5=4055.1 dist=18.0km uri=https://api.purpleair.com/v1/sensors/206005?fields=pm2.5