Title of statistical activity: Monitoring of air and water quality (until 2015)

Code of statistical activity: 10201

  1. Contact
  2. Metadata update
  3. Statistical presentation
  4. Unit of measure
  5. Reference period
  6. Institutional mandate
  7. Confidentiality
  8. Release policy
  9. Frequency of dissemination
  10. Accessibility and clarity
  11. Quality management
  12. Relevance
  13. Accuracy and reliability
  14. Timeliness and punctuality
  15. Coherence and comparability
  16. Cost and burden
  17. Data revision
  18. Statistical processing

1. Contact Individual or organisational contact points for the data or metadata, including information on how to reach the contact points.

1.1. Contact organisation The name of the organisation of the contact points for the data or metadata.

Statistics Estonia

1.2. Contact organisation unit An addressable subdivision of an organisation.

Economic and Environmental Statistics Department

1.3. Contact name The name of the contact points for the data or metadata.

Evelin Enno

1.4. Contact person function The area of technical responsibility of the contact, such as "methodology", "database management" or "dissemination".

Leading Statistician

1.5. Contact mail address The postal address of the contact points for the data or metadata.

51 Tatari Str, 10134 Tallinn, Estonia

1.6. Contact email address E-mail address of the contact points for the data or metadata.


1.7. Contact phone number The telephone number of the contact points for the data or metadata.

+372 625 9308

2. Metadata update The date on which the metadata element was inserted or modified in the database.

2.1. Metadata last certified Date of the latest certification provided by the domain manager to confirm that the metadata posted are still up-to-date, even if the content has not been amended.


2.2. Metadata last update Date of last update of the content of the metadata.


3. Statistical presentation

3.1. Data description Main characteristics of the data set described in an easily understandable manner, referring to the data and indicators disseminated.

Values measured at the monitoring sites: monthly amount of precipitation (mm), number of rainy days, average monthly temperature, maximum and minimum temperature, number of sunshine hours, relative humidity, average and maximum dose rate (nSv/h); sulphur dioxide, nitrogen dioxide, carbon monoxide, particulate matter and phenols concentration in air; concentration of sulphates, nitrates, chlorides and ammonia in precipitation

3.2. Classification system Arrangement or division of objects into groups based on characteristics which the objects have in common.

Not used.

3.3. Sector coverage Main economic or other sectors covered by the statistics.

Country – total

3.4. Statistical concepts and definitions Statistical characteristics of statistical observations.

Amount of precipitation – thickness of a water layer (in millimetres) which is composed of rain, freezing rain, drizzle, ice needles, snow, ice pellets sleet and hail or other types of precipitation falling on the earth upon condition that water doesn’t dissipate, doesn’t drip (trickle) into the earth and doesn’t vapour.

Number of rainy days – total number of the days when the sum of diurnal precipitation was equal to or more than 0.1 mm.

Relative humidity – the ratio of the partial pressure of water vapour in the mixture to the saturated vapour pressure of water at a prescribed temperature. Relative humidity is expressed as a percentage.

Dose rate – growth of dose in a time unit, the unit Sv/h (sievert per hour).

Gamma radiation (rays) – radiation produced by higher-energy photons which are separated from the unstable nucleus of an atom. In passing through a material, gamma radiation causes ionization of atoms, especially when interacting with electrons. Gamma rays have good permeation ability and only a very thick layer of high-density material (steel, concrete or lead) can act as a good shielding.

Natural background radiation – cosmic radiation (streams of cosmic radiation sent to the Earth by the Sun and stars); natural terrestrial radiation and radionuclides in food, etc. which constitute a natural environment for humans. In general, the natural background radiation in Estonia is below 300 nSv/h.

Carbon monoxide (CO) – a colourless and odourless gas which is a product of incomplete combustion of carbon compounds (fuels). The biggest sources of CO in urban air are vehicles and household heating.

LV – Limit Value of pollutant (until 2001, PCL or maximum Permissible Concentration Limit of pollutant was used).

LV₁ – one-hour mean limit value of pollution level.

LV₈– eight-hour mean sliding-scale limit value of pollution level.

LV₂₄ – 24-hour mean limit value of pollution level.

Nitrogen dioxide (NO₂) – a toxic gas which is generated for example in the cylinder of an explosion engine and is released into the atmosphere in the composition of exhaust gas discharged from vehicles.

Particulate matter (PM₁₀) – particles which can pass a cut-off of the aerodynamic diameter 10 µm in 50% of cases (fine particles less than 10 µm in diameter). Most kinds of anthropogenic particulate matter are included in this particle size fraction (e.g. fly ash formed as a result of combustion process, carbon black).

Phenol (C₆H₅OH) or carbolic acid – a slightly pink, toxic, crystalline substance which is soluble in water (~8 g / 100 ml). The term ‘phenol’ is used to denote the chemical compounds in which hydroxyl (-OH) is bound with an aromatic ring. Water of thermolysis of Estonian shale includes unique double-atomic phenols, for example methylresorcinols.

Sulphur dioxide (SO₂) – a colourless toxic gas of irritating sulphurous odour and very easily soluble in water. Sulphur dioxide is formed in the combustion of fuels which contain sulphur. In towns and cities, the main sources of SO₂ are boiler houses and vehicles.

3.5. Statistical unit Entity for which information is sought and for which statistics are ultimately compiled.

Monitoring site

3.6. Statistical population The total membership or population or "universe" of a defined class of people, objects or events.

Monitoring sites


Not applicable.

3.7. Reference area The country or geographic area to which the measured statistical phenomenon relates.

Weather data – the Pärnu, Tallinn-Harku, Jõhvi, Narva-Jõesuu, Tartu-Tõravere and Viljandi monitoring sites

Air radiation data – the Kunda, Kärdla, Mustvee, Narva-Jõesuu, Pärnu, Sõrve, Tallinn, Türi, Valga and Võru monitoring sites

Pollutants in air – the Tallinn, Kohtla-Järve and Narva monitoring sites

Pollutants in precipitation – the Tallinn, Tooma, Jõhvi, Tiirikoja, Kunda and Narva-Jõesuu monitoring sites

3.8. Time coverage The length of time for which data are available.


3.9. Base period The period of time used as the base of an index number, or to which a constant series refers.

Not applicable.

4. Unit of measure The unit in which the data values are measured.

Precipitation (in month) – mm

Rainy days – number

Average monthly temperature – °C

Sunshine – hours in month

Average monthly relative humidity – %

Average dose rate – nSc/h; maximum dose rate – nSc/h

Pollutants in precipitation – mg/l

5. Reference period The period of time or point in time to which the measured observation is intended to refer.


6. Institutional mandate

6.1. Legal acts and other agreements Legal acts or other formal or informal agreements that assign responsibility as well as the authority to an agency for the collection, processing, and dissemination of statistics.


Not available.

Official Statistics Act


Not available.

7. Confidentiality A property of data indicating the extent to which their unauthorised disclosure could be prejudicial or harmful to the interest of the source or other relevant parties.

7.1. Confidentiality - policy Legislative measures or other formal procedures which prevent unauthorised disclosure of data that identify a person or economic entity either directly or indirectly.

The dissemination of data collected for the purpose of producing official statistics is guided by the requirements provided for in § 34 and § 35 of the Official Statistics Act.

7.2. Confidentiality - data treatment Rules applied for treating the data set to ensure statistical confidentiality and prevent unauthorised disclosure.

Not applicable.

8. Release policy Rules for disseminating statistical data to interested parties.

8.1. Release calendar The schedule of statistical release dates.

Notifications about the dissemination of statistics are published in the release calendar, which is available on the website. On 1 October each year, the release times of the Statistical Database, news releases, main indicators by IMF SDDS and publications are announced in the release calendar (in case of publications – the release month).

8.2. Release calendar access Access to the release calendar information.


8.3. User access The policy for release of the data to users, the scope of dissemination (e.g. to the public, to selected users), how users are informed that the data are being released, and whether the policy determines the dissemination of statistical data to all users.

All users have been granted an equal access to official statistics: this means that the dissemination dates of official statistics have to be announced in advance and no user category (incl. Eurostat, state authorities and mass media) can have access to the official statistics (results of official statistical surveys) before other users. Statistical information is first published in the Statistical Database. In case a news release is published based on the same data, the information provided in the relevant news release is simultaneously published in the Statistical Database. Official statistics are available on the website at 8.00 a.m. on the date announced in the release calender.

9. Frequency of dissemination The time interval at which the statistics are disseminated over a given time period.



10. Accessibility and clarity

10.1. News release Regular or ad-hoc press releases linked to the data.

Not published.

10.2. Publications Regular or ad-hoc publications in which the data are made available to the public.

„Eesti statistika aastaraamat. Statistical Yearbook of Estonia”

10.3. Online database Information about on-line databases in which the disseminated data can be accessed.

Data are published under the heading „Environment/ State of environment” in the Statistical Database in http://pub.stat.ee.

10.4. Microdata access Information on whether micro-data are also disseminated.

Not applicable.

10.5. Other References to the most important other data dissemination done.

Data serve as input for statistical activity 50101 „Estonian regional development”.

10.6. Documentation on methodology Descriptive text and references to methodological documents available.

Meteorological observations are made and the parameters are calculated according to the methodology approved by the World Meteorological Organization (WMO).

The levels of radioactivity are monitored pursuant to the Commission Recommendation of 23 October 2006 adapting Recommendation 2000/473/Euratom on the application of Article 36 of the Euratom Treaty concerning the monitoring of the levels of radioactivity in the environment for the purpose of assessing the exposure of the population as a whole, by reason of the accession of Bulgaria and Romania (notified under document number C(2006) 4931).


10.7. Quality documentation Documentation on procedures applied for quality management and quality assessment.

Not available.

11. Quality management Systems and frameworks in place within an organisation to manage the quality of statistical products and processes.

11.1. Quality assurance All systematic activities implemented that can be demonstrated to provide confidence that the processes will fulfil the requirements for the statistical output.

To assure the quality of processes and products, Statistics Estonia applies the EFQM Excellence Model, EU Statistics Code of Practice and the ESS Quality Assurance Framework (QAF). Statistics Estonia is also guided by the requirements provided for in § 7. „Principles and quality criteria of producing official statistics” of the Official Statistics Act.

11.2. Quality assessment Overall assessment of data quality, based on standard quality criteria.

Statistics Estonia performs all statistical activities according to an international model (Generic Statistical Business Process Model – GSBPM). According to the GSBPM, the final phase of statistical activities is overall evaluation using information gathered in each phase or sub-process (this information includes, among other things, feedback from users, process metadata, system metrics and suggestions from employees). This information is used to prepare the evaluation report which outlines all the quality problems related to the specific statistical activity and serves as input for improvement actions.

12. Relevance The degree to which statistical information meet current and potential needs of the users.

12.1. User needs Description of users and their respective needs with respect to the statistical data.

Ministry of the Interior

Ministry of Social Affairs

City Council of Tartu

City Council of Pärnu

Eesti Pank

Estonian University of Life Sciences

National Institute for Health Development


Users’ suggestions and information about taking them into account are available on the SE website https://www.stat.ee/statistikatood.

12.2. User satisfaction Measures to determine user satisfaction.

Since 1996 Statistics Estonia conducts reputation surveys and user surveys.

All results are available on the website https://www.stat.ee/user-surveys.

12.3. Completeness The extent to which all statistics that are needed are available.

13. Accuracy and reliability Accuracy: closeness of computations or estimates to the exact or true values that the statistics were intended to measure.
Reliability: closeness of the initial estimated value to the subsequent estimated value.

13.1. Overall accuracy Assessment of accuracy, linked to a certain data set or domain, which is summarising the various components.

The type of survey and the data collection methods ensure sufficient coverage and timeliness.

13.2. Sampling error That part of the difference between a population value and an estimate thereof, derived from a random sample, which is due to the fact that only a subset of the population is enumerated.

Not applicable.

13.3. Non-sampling error Error in survey estimates which cannot be attributed to sampling fluctuations.

Not measured.

14. Timeliness and punctuality

14.1. Timeliness Length of time between data availability and the event or phenomenon they describe.

The data are released 20 days upon the end of the reference month (T+20) and 300 days upon the end of the reference year (T+300).

(2012) T+18

(2011) T+18

(2010) T+19

(2009) T+20

(2008) T+19

(2007) T+20

14.2. Punctuality Time lag between the actual delivery of the data and the target date when it should have been delivered.

The data have been published at the time announced in the release calender.

15. Coherence and comparability

15.1. Comparability - geographical The extent to which statistics are comparable between geographical areas.

The data are geographically comparable.

15.2. Comparability - over time The extent to which statistics are comparable or reconcilable over time.

The data are comparable across time.

15.3. Coherence - cross domain The extent to which statistics are reconcilable with those obtained through other data sources or statistical domains.

Not applicable.

15.4. Coherence - internal The extent to which statistics are consistent within a given data set.

Not applicable.

16. Cost and burden Cost associated with the collection and production of a statistical product and burden on respondents.

17. Data revision Any change in a value of a statistic released to the public.

17.1. Data revision - policy Policy aimed at ensuring the transparency of disseminated data, whereby preliminary data are compiled that are later revised.

The data revision policy and notification of corrections are described in the dissemination policy of Statistics Estonia https://www.stat.ee/dissemination-policy.

17.2. Data revision - practice Information on the data revision practice.

Not applicable.

18. Statistical processing

18.1. Source data Characteristics and components of the raw statistical data used for compiling statistical aggregates.


Not used.


Observation data (from Pärnu, Jõhvi, Tallinn-Harku, Jõhvi, Narva-Jõesuu, Tartu-Tõravere and Viljandi weather stations) are received from the Estonian Environment Agency. Data on radiation (from 10 monitoring stations) are received from the Radiation Safety Department of the Environmental Board. Data on the components of ambient air pollution are received from the Estonian Environmental Research Centre.


Not used.

18.2. Frequency of data collection Frequency with which the source data are collected.



18.3. Data collection Systematic process of gathering data for official statistics.

18.4. Data validation Process of monitoring the results of data compilation and ensuring the quality of statistical results.

The data are compared with the data of previous periods.

18.5. Data compilation Operations performed on data to derive new information according to a given set of rules.

The indicators to be published are calculated on the basis of the data collected by the Estonian Environment Agency.

18.6. Adjustment The set of procedures employed to modify statistical data to enable it to conform to national or international standards or to address data quality differences when compiling specific data sets.

Not applied.

19. Comments Supplementary descriptive text which can be attached to data or metadata.

Not available.