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Ambient Air Quality monitoring guidelines
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Ambient Air Quality monitoring guidelines

Ambient Air Quality Monitoring is an important part of Environmental Monitoring. Before commencing Ambient Air Quality monitoring there are certain guidelines which needs to be followed. Ambient Air Quality monitoring guidelines minimize the risk of getting wrong data due to improper methods.

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Guidelines before Ambient Air Quality monitoring

Background information needs to be collected consists of details of below mentioned details:

Sources and emissions

It includes details about number of vehicles, type of fuel used, composition of fuel used, number of stacks present, height of stacks etc. this data will help in identifying which pollutant can be present and can be measured.

Health and demographic information

This data can help to identify whether are they complaining about pollutants. can be installed in heavy population density areas.

Meteorological data

Temperature, humidity, wind speed and direction needs to be collected. Wind directions, humidity plays an important role in placement of Ambient Air Quality monitoring system.

Topographical information

If there are any river valleys, mountains in monitoring area then variation in concentration of pollutants is large.

Previous Ambient Air Quality information

Historical data can help to see magnitude of problem i.e. concentration of pollutants is showing upward or downward trend.

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Ambient Air Quality monitoring guidelines

Numbers and location of Ambient Air Quality monitoring locations

Historical or current information about pollutants present in air can give idea about number and placement of locations. As per Ambient Air Quality monitoring guidelines number of sites are depends upon size of area, Variation of pollutants, Data requirements, number of pollutants to be monitored.

The number of Ambient Air Quality monitoring stations can be increased or decreased based upon historical data trends. It is also depends on density of population, number of industries and vehicles etc.

Guidelines for Selection of monitoring location

Ambient Air Quality monitoring should be done in areas where pollution problem exists and is expected. Eg. Industrial areas, traffic intersections roads, high population density area etc. Selection of sampling point should be done carefully as incorrect location may result in high or low concentration of pollutants present in air and it will not meet objective of Ambient Air Quality monitoring.

Below are the Ambient Air Quality monitoring guidelines for selection of sampling point:

  • The site should be away from major pollution sources i.e. chimney, stacks etc. it should have at least 25 m distance from source.
  • The site should be away from absorbing material or surfacesAir Quality monitoring Station
  • Site chose for monitoring should be available (No reconstruction or new construction) for long period i.e. in years. Because change in Air Quality Monitoring Station may mislead trends.
  • should be placed where free air flow is available. It should be open from all sides.
  • While sampling traffic data it is recommended that sampling instrument should be 3m above from ground as it can absorb unnecessary particles which are non-pollutants
  • Sampling instrument on unpaved roads should be 200m far from roads. It will prevent dust entering into instrument from movement of vehicles
  • Site should have sheltering, Electricity, water etc.
  • The distance of sampling point from road is depends on number of vehicles running on that road.
  • Sampler must be at least 20 m Away from trees
  • Distance of sampler from any building should be double the height of building from sampler.

Read more about New Trends in Air Quality Monitoring

Guidelines for Selection of Pollutants

Most commonly carbon monoxide, SO2, NO2, SPM and RSPM are monitored on regular basis. As per Ambient Air Quality monitoring guidelines if monitoring area is industrial area then expected pollutants are also needs to be monitored on regular basis.

If resources are available then Polycyclic Aromatic, Hydrocarbons (PAHs), ozone can also be monitored.

Ambient Air Quality monitoring guidelines

In high population and traffic areas SO2, NO2, RSPM, SPM and CO can be monitored.

In industrial areas RSPM/PM10, SO2 can be monitored.

In soil borne dust, dust originating from construction activities SPM can be monitored.

Ares where downwind flow is present there ozone can be monitoring as Ozone O3 is present in upper layer of atmosphere. It is formed due to reactions of pollutants present in atmosphere.

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Guidelines for Sampling duration and frequency

To get annual average of pollutants present in atmosphere it is recommended that minimum 104 monitoring for 24 hrs i.e. twice a week. Pollutants behave very differently in each season. That is why to calculate annual average sampling should be done over the year.

Guidelines for Measurement Methods

Instrument used in monitoring should be easy to use, requires minimum maintenance and well calibrated. Automatic or online Ambient Air Quality samplers are complex, costly and requires skilled manpower to operate them. High volume sample is most commonly used air sampler in India.

  • Glassware must be clean
  • Chemical used in sampling must be analytical grade
  • Double distilled water must be used while preparing reagents
  • Glassware and bottles must be rinsed with distilled water only
  • Reagent bottles should have name of reagent, concentration, date of preparation, expiry date and name of chemist who prepared that reagent.
  • Reagent bottles must be air tight before use
  • The chemicals whose strength changes over period of time should be normalized before using
  • Storage of chemicals should be away from sunlight
  • Analytical balance should have sensitivity of 0.1 mg of weight

You can refer to our online air monitoring calculator to calculate mass concentration, total volume of air and Particulate matter.

Guidelines for meteorological Measurements

Meteorology plays an important role in study of air pollution. It is necessary to measure meteorology parameters. Essential meteorological parameters should be measured are wind speed, direction, humidity, temperature, rainfall, atmospheric pressure etc. Moisture is measured because absence of moisture may lead in drying of mucous, sore throat and cough.

Guidelines for laboratory requirements

Analytical Laboratory

The samples collected from site are analysed in laboratory. It should be near from site so that loss due to incorrect handling and transportation can be minimalized. Laboratory should have apparatus like refrigerator, balance oven spectrophotometer etc. and all instruments needs to be calibrated to reduce errors.

Let us know if you have any questions or suggestion about Ambient Air Quality monitoring guidelines.

Read more about Environmental Monitoring Methods

Sources : CPCB, EPA,

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Ambient Air Quality monitoring guidelines