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Ambient Air Quality Monitoring Systems

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Schematic of Extractive Ambient Air Quality Monitoring System
Schematic of In-Situ Ambient Air Quality Monitoring System

Extractive Ambient Air Quality Monitoring System


In-Situ Ambient Air Quality Monitoring System


Automatic Make Up of your Ambient Air Quality Monitoring System

Primary Benefits of Extractive Systems:

  • Conducts measurements in a point
  • Gas analyzers, dust meters, which are used in the system, are specially designed to control only one specific component resulting in balanced technical characteristics i.e. sensitivity, accuracy, interference to other components etc. are as a rule in compliance with the national requirements for ambient air control
  • Calibration is conducted in a conventional way with the help of gases in cylinders (approved worldwide for the most gases) or gas generators (approved in some countries)
  • The system is located in a pavilion or in a room in a building and includes a block of functioning control
  • The system is more safe
  • The system can be readily expanded. Other gas analysers or dust meters can be added more cost effective

Primary Benefits of In-Situ Systems:

  • Conducts measurements on path
  • Measurements on path (integral evaluation of air pollution) are considered more representative for evaluation of average air pollution levels of cities, industrial areas etc.
  • Only one multi-components optical gas analyzer is used in a system as a rule, which is more convenient and less expensive in a maintenance
  • Calibration is conducted in a special way with the help of special standards. It is adopted that the ambient concentration of a pollutant over the monitoring path would be equivalent to a much higher concentration of the pollutant contained in a short calibration cell inserted into the optical beam of an open path analyzer during a precision test or accuracy audit. So running-gas or sealed short gas cells or compliant internal calibration standarts can be used
  • No need of any pavilion or a room for the system location as a rule


What purposes the system will be used for?

to get air polution levels for official use (to present it to state environmental control agency or to receive measured air polution directly by state agency)
for use by/in industry for its own needs
for scientific/educational purposes

Will the system be used to control the air pollution transfer from a plant or factory?

yes no

Check up the components:

Sulphur dioxide SO2 Nitrous oxide NO Nitrogen dioxide NO2
Carbon monoxide CO Ozone O3
Mercury Hg
PM2.5 PM10 TSP
Hydrogen fluoride HF Hydrogen chloride HCl Chlorine Cl2
Bromine Br2 Ammonia NH3 Hydrogen sulphide H2S
acid HNO2
Phosgene COCl2
Sulphur trioxide SO3 Hydrogen cyanide CHN2 Carbon disulphide CS2
Hydrogen bromide HBr Nitrous oxide N2O Carbon dioxide CO2
Total hydro-
carbons THC
Methane CH4 Benzene C6H6
Toluene C7H8 Formal-
dehyde HCHO
Naftalene C10H8
dehyde C2H4O
Propane C3H8 Ethyl-
benzene C6H5C2H5
Methanol CH4O Acethylene C2H2 Ethane C2H6
Ethene C2H4 Ethanol C2H6O Phenol C6H5OH

What world region the system will be used in?

USA or Canada European Union Russia, Other Countries

Primary Limitations of Extractive Systems:

  • Requires sampling with a sample contact. Change of concentration of studied species in a sample is possible because of cross-reaction of components and/or adsorption
  • Requires calibration by gases in cylinders or by gas generators as well as requires manifolds, pumps, manometers, valves, control and test equipment for conducting frequent periodic system calibration
  • Slower response due to sample transit time
  • Generally more expensive especially in exploitation

Primary Limitations of In-Situ Systems:

  • Not so many components are approved to be controlled for an official presentation
  • Hard weather conditions can influence on result and/or duration of measurements
  • Influence of interfering components on result of measurement is generally stronger for multi-components gas analyzers - In-Situ analyzers in our case


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