Frebruary stats for Sensor.Community (formerly Luftdaten . info) servers:
Total traffic: 27 TByte (API, maps, archive)
API server: 220 req/sec, 380 GByte/day
SQL server: 3900 queries/sec., 640KBytes/sec in, 1.6 MBytes/sec out
13.600 devices active (in 73 countries)