Higher levels of CO2 in a building are an indicator of poor ventilation which increases the risk of COVID-19 spreading.
For this and other important reasons, a very useful tool is the bestseller wireless CO2, RH and Temperature data logger, model ΜΧ1102 by ONSET (U.S.A.).
For further info, see the following pdf:
On-line quality parameters monitoring systems
WATER QUALITY AND METEOROLOGICAL STATION IN THE SALT LAGOON OF AEGIALIA MUNICIPALITY
Water quality and meteorological station
EASTERN MACEDONIA & THRACE (G.O.E.V. ORESTIADAS)
Telemetry Network for Water discharge Measurement
N.E.C.C.A MANAGEMENT UNIT OF NESTOS DELTA – VISTONIDA - ISMARIDA AND THASOS - PORTO LAGOS
Telemetric Hydrological Network