NEMo Outdoor – Ambient air monitoring for industries and smart cities

LVOC – TVOC – Temperature – Humidity – Pressure – NO2 – O3 – PM1-2.5-10

Air quality in cities is a major issue nowadays. Residents’ health condition can be easily affected by air pollution which causes allergies, respiratory tract infections and cardiovascular diseases. To address this challenge, cities are setting up a network of sensors to carry out simulation and pollution prediction models to better advice inhabitants.








What kinds of pollutant in the city?


Particulate matter: PM 1/2.5/10

Particulate matter accounts for most of the health costs linked to the quality of outdoor air. By entering the body it causes cardiovascular, cerebral diseases and infections of the respiratory system. Their origins are diverse: diesel without a treatment system, fireplaces, industry, vehicle brakes and tire wear.

How to measure Particulate matter (PM) ?

 The reference method uses recovery from a particle filter and weighing thereafter. Sensor networks use a different method because it is complicated to automate and democratize. PM sensors use a laser that quantifies their number and then establishes a relationship with their mass to know the quantity.



Benzene comes mainly from the use of hydrocarbons. Very reactive, it is one of the most dangerous pollutants even at low concentrations. 


Nitrogen dioxide – NO2

Nitrogen dioxide comes from the combustion of hydrocarbons. It is therefore mainly generated by road traffic. NO2 is an irritant for the respiratory tract.


Ozone – O3

Ozone or O3 has several origins but mainly it comes from chemical reactions between NOx and VOCs present in the air and undergoing UV radiation from the sun leading to their destruction to produce ozone. Since NOx and VOCs are mainly produced by human activity, ozone is found in high concentration in active areas. Its concentration increases with the presence of anti-cyclone. Ozone is an ENT pathway irritant.


Other pollutants

VOCs (Volatile Organic Compounds), NO, NH3, CO, SO2 are also found in outdoor air but their concentrations and / or their effects on health make them less of a priority in the evaluation of the quality of outside air.

How to measure air pollutants in the city ?

For years, associations have been measuring air quality with very precise and expensive reference stations. In recent years a new strategy has emerged with the establishment of a network of outdoor air quality sensors. These are less precise but their number makes it possible to compensate for this defect and above all, to improve monitoring as the importance of the local environment impacts the results. It is common to find that on both sides of a building the air quality is different.

Outdoor air quality station NEMo Ext

For ten years Ethera has been designing air analysis devices and putting its unique resources in France at the service of the development of sensors dedicated to the quality of outdoor air, to their characterization and to their integration into functional and autonomous units. , the NEMo range.

The outdoor NEMo station allows continuous measurement of several parameters such as:

  • NO2 / O3
  • PM 1; PM 2.5; PM 10
  • NH3
  • H2S
  • SO2
  • CO2
  • CO
    It is designed to operate in complete autonomy on solar panel or battery. This station is connected with modern means of communication; Sigfox, LoRa, LTE-M.



Discover a turn key solution to monitor outdoor air quality


Monitoring des ambiances de travail aux abords de la production et dans les bureaux 
Suivi en exploitation des bâtiments performants en énergie, labellisation WELL 
Pilotage des systèmes de ventilation
Surveillance de la Qualité de l’Air Intérieur dans les Etablissements Recevant du Public 
Contrôle de l’efficacité des systèmes de filtration

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  • Measurement of real exposure to pollutants and identification of pollution peaks.
  • Possibility of adding a PID sensor with PID technology for VOC monitoring.
  • Exclusive design for a cost effective target.
  • Modular and scalable, possibility of adding additional sensors (PM2.5 / PM10, VOC, NO2, O3, H2S, NH3, SO2 …).
  • Connected device for real-time access to measurements (Sigfox, LoRa, Bluetooth, GSM).
  • Dashboard in option on a cloud solution