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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">gesj</journal-id><journal-title-group><journal-title xml:lang="en">GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY</journal-title><trans-title-group xml:lang="ru"><trans-title>GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2071-9388</issn><issn pub-type="epub">2542-1565</issn><publisher><publisher-name>Russian Geographical Society</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.24057/2071-9388-2019-97</article-id><article-id custom-type="elpub" pub-id-type="custom">gesj-1188</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>RESEARCH PAPER</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>Analyzing and forecasting ambient air quality of Chennai city in India</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Nadeem</surname><given-names>Imran</given-names></name></name-alternatives><bio xml:lang="en"><p>Department of Mathematics</p><p>GST Road Vandalur 600048, Chennai</p></bio><email xlink:type="simple">malikimrannadeem218@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Ilyas</surname><given-names>Ashiq M.</given-names></name></name-alternatives><bio xml:lang="en"><p>Department of Mathematics</p><p>GST Road Vandalur 600048, Chennai</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Uduman</surname><given-names>P.S. Sheik</given-names></name></name-alternatives><bio xml:lang="en"><p>Department of Mathematics</p><p>GST Road Vandalur 600048, Chennai</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>B.S Abdur Rahman Crescent Institute of Science and Technology</institution><country>India</country></aff><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>10</day><month>07</month><year>2020</year></pub-date><volume>13</volume><issue>3</issue><fpage>13</fpage><lpage>21</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Nadeem I., Ilyas A.M., Uduman P.S., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Nadeem I., Ilyas A.M., Uduman P.S.</copyright-holder><copyright-holder xml:lang="en">Nadeem I., Ilyas A.M., Uduman P.S.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://ges.rgo.ru/jour/article/view/1188">https://ges.rgo.ru/jour/article/view/1188</self-uri><abstract><p>Regardless of the existing governmental and public preventive actions for surveillance and controlling the air quality in several regions of the Chennai city in India, the air quality does not meet the desired standard. In this regard, this study employs an ARMA/ARIMA modelling approach for forecasting Respirable Suspended Particulate Matter (RSPM), Sulphur dioxide (SO2) and Nitrogen dioxide (NO2) concentration for three most polluted sites in Chennai city. A total of nine univariate linear stochastic models have been developed, three for each of the stations which includes one for each of the specific pollutants in order to forecasts the concentration of each pollutant. The evaluation of the model statistics R2 values and index of agreement values evince that a significant level of real-time forecasting of the pollutants can be achieved by employing the developed ARMA/ARIMA models. Moreover, the comparisons of actual air pollutant concentration have been carried out with the permissible limit as prescribed by the National ambient air quality standards (NAAQS) of India for assessing the level of pollution of all three locations.</p></abstract><kwd-group xml:lang="en"><kwd>ARMA/ARIMA models</kwd><kwd>Information-criteria</kwd><kwd>Ljung-Box test</kwd><kwd>Real-time forecasting</kwd><kwd>Time series analysis</kwd></kwd-group><funding-group><funding-statement xml:lang="en">Authors are highly thankful to anonymous reviewers for their positive comments to bring constructive changes in the manuscript</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Adebiyi A.A., Adewumi A.O. and Ayo C.K. (2014). Comparison of ARIMA and artificial neural networks models for stock price prediction. 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