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        <gco:CharacterString>V souladu s přílohou 2 Vyhlášky 106/2025 Sb., kterou se provádí některá ustanovení zákona o veřejné hydrometeorologické službě, ČHMÚ zpřístupnil operativní (neverifikované) primární a agregované údaje pro látky znečišťující venkovní ovzduší (koncentrace znečišťujících látek ze stanic s automatickým programem v rozsahu a časových agregacích dle zákona č. 201/2012 Sb., o ochraně ovzduší). Jedná se o základní znečišťující látky s imisním limitem dle současné legislativy: arsen (As), benzen, benzo[a]pyren, kadmium (Cd), oxid uhelnatý (CO), nikl (Ni), oxid dusičitý (NO₂), oxidy dusíku (NOₓ), přízemní ozon (O₃), olovo (Pb), suspendované částice PM₁₀, suspendované částice PM₂.₅, oxid siřičitý (SO₂). Údaje vycházejí z naměřených dat na stanicích ve vlastnictví ČHMÚ za období od roku 1969. Primární data jsou uvedena v intervalech měření: 30 min, 1 h nebo 24 h dle typu měření. Agregovaná data jsou vypočtena z výše uvedených primárních dat. Jedná se o tyto údaje: denní průměry, měsíční průměry, roční průměry a počty překročení hodnoty imisního limitu. Předběžné údaje obsahují data o kvalitě ovzduší starší než hodinu. Verifikovaná data se nachází v datové sadě Měření kvality ovzduší – ověřené údaje, a to v souladu s procesem verifikace naměřených dat. K verifikaci dochází jednou ročně, nejpozději k 1.7. (RRRR-1).</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#locale-eng">In accordance with Annex 2 of Decree 106/2025 Coll., which implements certain provisions of the Act on the Public Hydrometeorological Service, the Czech Hydrometeorological Institute (CHMI) has made operational (unverified) primary and aggregated data available for outdoor air pollutants (pollutant concentrations from automatic monitoring stations, provided in the scope and temporal aggregations specified by Act No. 201/2012 Coll., on Air Protection).  

The data include key pollutants with ambient air limit values under current legislation: arsenic (As), benzene, benzo[a]pyrene, cadmium (Cd), carbon monoxide (CO), nickel (Ni), nitrogen dioxide (NO₂), nitrogen oxides (NOₓ), ground-level ozone (O₃), lead (Pb), suspended particles PM₁₀, suspended particles PM₂.₅, and sulfur dioxide (SO₂).  

The data are based on measurements from CHMI-owned stations since 1969. Primary data are provided in measurement intervals of 30 minutes, 1 hour, or 24 hours, depending on the type of measurement. Aggregated data are calculated from the aforementioned primary data and include the following: daily averages, monthly averages, annual averages, and the number of exceedances of ambient air limit values.  Preliminary data include air quality information that is older than one hour. Verified data can be found in the dataset *Air Quality Measurements – Verified Data*, in accordance with the data verification process. Verification is carried out once a year, no later than July 1st (YYYY-1).</gmd:LocalisedCharacterString>
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                <gmd:LocalisedCharacterString locale="#locale-eng">nickel</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>oxid dusičitý</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">nitrogen dioxide</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>oxidy dusíku</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">nitrogen oxides</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>přízemní ozon</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">ground-level ozone</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>olovo</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">lead</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>suspendované částice PM10</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">particulate matter PM10</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>suspendované částice PM2.5</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">particulate matter PM2.5</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>oxid siřičitý</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">sulphur dioxide</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>ČHMÚ</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">CHMI</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>Český hydrometeorologický ústav</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">Czech Hydrometeorological Institute</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>neverifikovaná data</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">unverified data</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>předběžné údaje</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">recent data</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
          <gmd:keyword xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>operativní data</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">operational data</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:keyword>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:resourceConstraints>
        <gmd:MD_LegalConstraints>
          <gmd:useConstraints>
            <gmd:MD_RestrictionCode codeListValue="otherRestrictions" codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_RestrictionCode">otherRestrictions</gmd:MD_RestrictionCode>
          </gmd:useConstraints>
          <gmd:otherConstraints xsi:type="gmd:PT_FreeText_PropertyType">
            <gmx:Anchor xlink:href="https://creativecommons.org/licenses/by/4.0/">Creative Commons BY 4.0</gmx:Anchor>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">Creative Commons BY 4.0</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:otherConstraints>
          <gmd:otherConstraints xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>https://creativecommons.org/licenses/by/4.0/legalcode.cs</gco:CharacterString>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">https://creativecommons.org/licenses/by/4.0/legalcode.en</gmd:LocalisedCharacterString>
              </gmd:textGroup>
            </gmd:PT_FreeText>
          </gmd:otherConstraints>
        </gmd:MD_LegalConstraints>
      </gmd:resourceConstraints>
      <gmd:resourceConstraints>
        <gmd:MD_LegalConstraints>
          <gmd:accessConstraints>
            <gmd:MD_RestrictionCode codeListValue="otherRestrictions" codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_RestrictionCode">otherRestrictions</gmd:MD_RestrictionCode>
          </gmd:accessConstraints>
          <gmd:otherConstraints xsi:type="gmd:PT_FreeText_PropertyType">
            <gmx:Anchor xlink:href="http://inspire.ec.europa.eu/metadata-codelist/LimitationsOnPublicAccess/noLimitations">bez omezení veřejného přístupu</gmx:Anchor>
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              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">no limitations to public access</gmd:LocalisedCharacterString>
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            </gmd:PT_FreeText>
          </gmd:otherConstraints>
          <gmd:otherConstraints xsi:type="gmd:PT_FreeText_PropertyType">
            <gmx:Anchor xlink:href="http://opendata.gov.cz/definition/opendata">Otevřená data ČR</gmx:Anchor>
            <gmd:PT_FreeText>
              <gmd:textGroup>
                <gmd:LocalisedCharacterString locale="#locale-eng">Open Data of the Czech Republic</gmd:LocalisedCharacterString>
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          </gmd:otherConstraints>
        </gmd:MD_LegalConstraints>
      </gmd:resourceConstraints>
      <gmd:spatialRepresentationType>
        <gmd:MD_SpatialRepresentationTypeCode codeListValue="textTable" codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_SpatialRepresentationTypeCode">textTable</gmd:MD_SpatialRepresentationTypeCode>
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      <gmd:language>
        <gmd:LanguageCode codeList="http://www.loc.gov/standards/iso639-2/" codeListValue="cze">cze</gmd:LanguageCode>
      </gmd:language>
      <gmd:language>
        <gmd:LanguageCode codeList="http://www.loc.gov/standards/iso639-2/" codeListValue="eng">eng</gmd:LanguageCode>
      </gmd:language>
      <gmd:topicCategory>
        <gmd:MD_TopicCategoryCode>climatologyMeteorologyAtmosphere</gmd:MD_TopicCategoryCode>
      </gmd:topicCategory>
      <gmd:topicCategory>
        <gmd:MD_TopicCategoryCode>environment</gmd:MD_TopicCategoryCode>
      </gmd:topicCategory>
      <gmd:topicCategory>
        <gmd:MD_TopicCategoryCode>health</gmd:MD_TopicCategoryCode>
      </gmd:topicCategory>
      <gmd:extent>
        <gmd:EX_Extent>
          <gmd:geographicElement>
            <gmd:EX_GeographicBoundingBox>
              <gmd:westBoundLongitude>
                <gco:Decimal>12.10</gco:Decimal>
              </gmd:westBoundLongitude>
              <gmd:eastBoundLongitude>
                <gco:Decimal>18.91</gco:Decimal>
              </gmd:eastBoundLongitude>
              <gmd:southBoundLatitude>
                <gco:Decimal>48.59</gco:Decimal>
              </gmd:southBoundLatitude>
              <gmd:northBoundLatitude>
                <gco:Decimal>51.04</gco:Decimal>
              </gmd:northBoundLatitude>
            </gmd:EX_GeographicBoundingBox>
          </gmd:geographicElement>
          <gmd:geographicElement>
            <gmd:EX_GeographicDescription>
              <gmd:geographicIdentifier>
                <gmd:RS_Identifier>
                  <gmd:code>
                    <gmx:Anchor xlink:href="http://publications.europa.eu/resource/authority/country/CZE">Česká republika</gmx:Anchor>
                  </gmd:code>
                </gmd:RS_Identifier>
              </gmd:geographicIdentifier>
            </gmd:EX_GeographicDescription>
          </gmd:geographicElement>
          <gmd:temporalElement>
            <gmd:EX_TemporalExtent>
              <gmd:extent>
                <gml:TimePeriod gml:id="TBE1">
                  <gml:beginPosition>2025-01-01</gml:beginPosition>
                  <gml:endPosition indeterminatePosition="now"/>
                </gml:TimePeriod>
              </gmd:extent>
            </gmd:EX_TemporalExtent>
          </gmd:temporalElement>
        </gmd:EX_Extent>
      </gmd:extent>
    </gmd:MD_DataIdentification>
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  <gmd:distributionInfo>
    <gmd:MD_Distribution>
      <gmd:distributionFormat>
        <gmd:MD_Format>
          <gmd:name>
            <gmx:Anchor xlink:href="http://www.iana.org/assignments/media-types/text/csv">CSV</gmx:Anchor>
          </gmd:name>
          <gmd:version>
            <gco:CharacterString>?</gco:CharacterString>
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        </gmd:MD_Format>
      </gmd:distributionFormat>
      <gmd:transferOptions>
        <gmd:MD_DigitalTransferOptions>
          <gmd:onLine>
            <gmd:CI_OnlineResource>
              <gmd:linkage>
                <gmd:URL>https://opendata.chmi.cz/air_quality/</gmd:URL>
              </gmd:linkage>
              <gmd:protocol>
                <gmx:Anchor xlink:href="https://services.cuzk.gov.cz/registry/codelist/OnlineResourceProtocolValue/WWW:LINK">WWW:LINK</gmx:Anchor>
              </gmd:protocol>
              <gmd:description>
                <gmx:Anchor xlink:href="http://www.iana.org/assignments/media-types/text/csv"/>
              </gmd:description>
              <gmd:function>
                <gmd:CI_OnLineFunctionCode codeListValue="download" codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_OnLineFunctionCode">download</gmd:CI_OnLineFunctionCode>
              </gmd:function>
            </gmd:CI_OnlineResource>
          </gmd:onLine>
        </gmd:MD_DigitalTransferOptions>
      </gmd:transferOptions>
    </gmd:MD_Distribution>
  </gmd:distributionInfo>
  <gmd:dataQualityInfo>
    <gmd:DQ_DataQuality>
      <gmd:scope>
        <gmd:DQ_Scope>
          <gmd:level>
            <gmd:MD_ScopeCode codeListValue="dataset" codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_ScopeCode"/>
          </gmd:level>
        </gmd:DQ_Scope>
      </gmd:scope>
      <gmd:report>
        <gmd:DQ_DomainConsistency>
          <gmd:result>
            <gmd:DQ_ConformanceResult>
              <gmd:specification>
                <gmd:CI_Citation>
                  <gmd:title xsi:type="gmd:PT_FreeText_PropertyType">
                    <gmx:Anchor xlink:href="https://data.europa.eu/eli/dir/2007/2">SMĚRNICE EVROPSKÉHO PARLAMENTU A RADY 2007/2/ES ze dne 14. března 2007 o zřízení Infrastruktury pro prostorové informace v Evropském společenství (INSPIRE)</gmx:Anchor>
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                        <gmd:LocalisedCharacterString locale="#locale-eng">DIRECTIVE 2007/2/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 14 March 2007 establishing an Infrastructure for Spatial Information in the European Community (INSPIRE)</gmd:LocalisedCharacterString>
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                    </gmd:PT_FreeText>
                  </gmd:title>
                  <gmd:date>
                    <gmd:CI_Date>
                      <gmd:date>
                        <gco:Date>2007-03-14</gco:Date>
                      </gmd:date>
                      <gmd:dateType>
                        <gmd:CI_DateTypeCode codeListValue="publication" codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#CI_DateTypeCode"/>
                      </gmd:dateType>
                    </gmd:CI_Date>
                  </gmd:date>
                </gmd:CI_Citation>
              </gmd:specification>
              <gmd:explanation xsi:type="gmd:PT_FreeText_PropertyType">
                <gco:CharacterString>Viz odkazovanou specifikaci</gco:CharacterString>
                <gmd:PT_FreeText>
                  <gmd:textGroup>
                    <gmd:LocalisedCharacterString locale="#locale-eng">See referenced specification</gmd:LocalisedCharacterString>
                  </gmd:textGroup>
                </gmd:PT_FreeText>
              </gmd:explanation>
              <gmd:pass>
                <gco:Boolean>false</gco:Boolean>
              </gmd:pass>
            </gmd:DQ_ConformanceResult>
          </gmd:result>
        </gmd:DQ_DomainConsistency>
      </gmd:report>
      <gmd:report>
        <gmd:DQ_DomainConsistency>
          <gmd:result>
            <gmd:DQ_ConformanceResult>
              <gmd:specification>
                <gmd:CI_Citation>
                  <gmd:title xsi:type="gmd:PT_FreeText_PropertyType">
                    <gmx:Anchor xlink:href="https://ofn.gov.cz/základní-datové-typy/">OFN: Základní datové typy</gmx:Anchor>
                    <gmd:PT_FreeText>
                      <gmd:textGroup>
                        <gmd:LocalisedCharacterString locale="#locale-eng">OFN: Basic data types</gmd:LocalisedCharacterString>
                      </gmd:textGroup>
                    </gmd:PT_FreeText>
                  </gmd:title>
                  <gmd:date>
                    <gmd:CI_Date>
                      <gmd:date>
                        <gco:Date>2020-07-01</gco:Date>
                      </gmd:date>
                      <gmd:dateType>
                        <gmd:CI_DateTypeCode codeListValue="publication" codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#CI_DateTypeCode"/>
                      </gmd:dateType>
                    </gmd:CI_Date>
                  </gmd:date>
                </gmd:CI_Citation>
              </gmd:specification>
              <gmd:explanation xsi:type="gmd:PT_FreeText_PropertyType">
                <gco:CharacterString>Viz odkazovanou specifikaci</gco:CharacterString>
                <gmd:PT_FreeText>
                  <gmd:textGroup>
                    <gmd:LocalisedCharacterString locale="#locale-eng">See referenced specification</gmd:LocalisedCharacterString>
                  </gmd:textGroup>
                </gmd:PT_FreeText>
              </gmd:explanation>
              <gmd:pass>
                <gco:Boolean>true</gco:Boolean>
              </gmd:pass>
            </gmd:DQ_ConformanceResult>
          </gmd:result>
        </gmd:DQ_DomainConsistency>
      </gmd:report>
      <gmd:lineage>
        <gmd:LI_Lineage>
          <gmd:statement xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>Operativní (neverifikovaná) data za cca posledních 18 měsíců, kvalita měření a údajů odpovídá požadavkům legislativy. Koncentrace látek znečišťujících ovzduší – předběžné primární a agregované údaje.</gco:CharacterString>
            <gmd:PT_FreeText>
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                <gmd:LocalisedCharacterString locale="#locale-eng">Operational (non-verified) data for approximately the last 18 months, with measurement and data quality meeting legislative requirements. Concentrations of air pollutants – preliminary primary and aggregated data.</gmd:LocalisedCharacterString>
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            </gmd:PT_FreeText>
          </gmd:statement>
        </gmd:LI_Lineage>
      </gmd:lineage>
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