{"title":"PM2.5 Observations of Outdoor and Indoor Environment at Dwarka, New Delhi, India","authors":"Shristy Malik, A. S. Rao, Surendra K. Dhaka","doi":"10.1007/s12647-023-00694-2","DOIUrl":null,"url":null,"abstract":"<div><p>Measurement of PM<sub>2.5</sub> is carried out simultaneously outdoors as well as indoors using a Compact and Useful PM<sub>2.5</sub> Instrument (CUPI) from Nov 2018 to Oct 2019. A high-time resolution data (~ 2 min interval) was recorded at Dwarka (West Delhi), New Delhi, to investigate the difference between outdoor and indoor ambient particulate matter. Year-long observations provide an opportunity to decipher that indoor PM<sub>2.5</sub> concentration increases significantly from mid-November 2018 to mid-December 2018. During this high concentration occurrence of PM<sub>2.5</sub>, outdoor concentration was higher in the range of 100–200 µg/m<sup>3</sup> than indoor. Indoor pollution was less by 30–50% in comparison to the outdoor environment. Analyses reveal that during a high pollution period, intermittently for a short period, outdoor PM<sub>2.5</sub> was less, which coincides with clear weather days suggesting that indoor pollution did not disperse due to a closed environment. Diurnal variation of PM<sub>2.5</sub> clearly shows high concentration stays until 12:00 noon in both indoor and outdoor environments, which reduces in the afternoon and again picks up in the evening. Diurnal variation of solar radiation showed a consistent increase from 9 am to 2 pm, while relative humidity declined considerably from 10 am to 4 pm (local time); these two factors correspond to less concentration in both indoor and outdoor environments. However, there is no significant difference between outdoor and indoor concentration during summer and monsoon season.</p></div>","PeriodicalId":689,"journal":{"name":"MAPAN","volume":"39 2","pages":"449 - 456"},"PeriodicalIF":1.0000,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"MAPAN","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s12647-023-00694-2","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"INSTRUMENTS & INSTRUMENTATION","Score":null,"Total":0}
引用次数: 0
Abstract
Measurement of PM2.5 is carried out simultaneously outdoors as well as indoors using a Compact and Useful PM2.5 Instrument (CUPI) from Nov 2018 to Oct 2019. A high-time resolution data (~ 2 min interval) was recorded at Dwarka (West Delhi), New Delhi, to investigate the difference between outdoor and indoor ambient particulate matter. Year-long observations provide an opportunity to decipher that indoor PM2.5 concentration increases significantly from mid-November 2018 to mid-December 2018. During this high concentration occurrence of PM2.5, outdoor concentration was higher in the range of 100–200 µg/m3 than indoor. Indoor pollution was less by 30–50% in comparison to the outdoor environment. Analyses reveal that during a high pollution period, intermittently for a short period, outdoor PM2.5 was less, which coincides with clear weather days suggesting that indoor pollution did not disperse due to a closed environment. Diurnal variation of PM2.5 clearly shows high concentration stays until 12:00 noon in both indoor and outdoor environments, which reduces in the afternoon and again picks up in the evening. Diurnal variation of solar radiation showed a consistent increase from 9 am to 2 pm, while relative humidity declined considerably from 10 am to 4 pm (local time); these two factors correspond to less concentration in both indoor and outdoor environments. However, there is no significant difference between outdoor and indoor concentration during summer and monsoon season.
期刊介绍:
MAPAN-Journal Metrology Society of India is a quarterly publication. It is exclusively devoted to Metrology (Scientific, Industrial or Legal). It has been fulfilling an important need of Metrologists and particularly of quality practitioners by publishing exclusive articles on scientific, industrial and legal metrology.
The journal publishes research communication or technical articles of current interest in measurement science; original work, tutorial or survey papers in any metrology related area; reviews and analytical studies in metrology; case studies on reliability, uncertainty in measurements; and reports and results of intercomparison and proficiency testing.