國立虎尾科技大學 |

Pilot Study of the Effectiveness of Low-Cost Gas-Phase Sensors for Monitoring Indoor and Outdoor Air Quality in Beijing, China.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Pilot Study of the Effectiveness of Low-Cost Gas-Phase Sensors for Monitoring Indoor and Outdoor Air Quality in Beijing, China./
作者:	Liu, Meichen.
面頁冊數:	1 online resource (79 pages)
附註:	Source: Masters Abstracts International, Volume: 56-05.
Contained By:	Masters Abstracts International56-05(E).
標題:	Environmental engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9780355240672

Pilot Study of the Effectiveness of Low-Cost Gas-Phase Sensors for Monitoring Indoor and Outdoor Air Quality in Beijing, China.
Liu, Meichen.

Pilot Study of the Effectiveness of Low-Cost Gas-Phase Sensors for Monitoring Indoor and Outdoor Air Quality in Beijing, China. - 1 online resource (79 pages)

Source: Masters Abstracts International, Volume: 56-05.

Thesis (M.S.)

Includes bibliographical references

Ground-level ozone values have been reported to be at unhealthy levels in many populated regions of China. An efficient and effective way for people to combat its harmful effects is seriously needed. However, there are only sparse measurements of ozone being made across China and more measurement sites are needed to understand health relevant concentrations both temporally and spatially. This is due in part to the fact that current monitoring approaches are costly and bulky. Ambient sensors with low cost, small size, and fast response time could potentially fill the current need. Our purpose in this study is to evaluate low cost, portable, and real-time sensors we hope to use in future studies. This study tested the effectiveness of the sensors in monitoring indoor and outdoor air quality, in particular ozone, in Beijing, China.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355240672Subjects--Topical Terms:

557376
Environmental engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Pilot Study of the Effectiveness of Low-Cost Gas-Phase Sensors for Monitoring Indoor and Outdoor Air Quality in Beijing, China.
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245 1 0 $a Pilot Study of the Effectiveness of Low-Cost Gas-Phase Sensors for Monitoring Indoor and Outdoor Air Quality in Beijing, China.
264 0 $c 2017
300 $a 1 online resource (79 pages)
336 $a text $b txt $2 rdacontent
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338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 56-05.
500 $a Adviser: Michael H. Bergin.
502 $a Thesis (M.S.) $c Duke University $d 2017.
504 $a Includes bibliographical references
520 $a Ground-level ozone values have been reported to be at unhealthy levels in many populated regions of China. An efficient and effective way for people to combat its harmful effects is seriously needed. However, there are only sparse measurements of ozone being made across China and more measurement sites are needed to understand health relevant concentrations both temporally and spatially. This is due in part to the fact that current monitoring approaches are costly and bulky. Ambient sensors with low cost, small size, and fast response time could potentially fill the current need. Our purpose in this study is to evaluate low cost, portable, and real-time sensors we hope to use in future studies. This study tested the effectiveness of the sensors in monitoring indoor and outdoor air quality, in particular ozone, in Beijing, China.
520 $a Seventeen sensors, which were to monitor indoor, outdoor, and personal ozone exposure in 7 homes, were collocated at Peking University (PKU) before and after running in selected residential homes. Pairwise comparisons were conducted using collocated sensor data with data from a standing reference sensor which was maintained by PKU to have best-fit regressions. Based on the best-fit regression when compiling both pre- and post- collocation periods, cleaned sensor data was calibrated and compared with reference data with R2 ranging from 0.63 to 0.97. Overall, the sensors are able to measure O 3 within +/-17 ppb. Average error of sensors after calibration is about -1 ppb. The geographical conditions and surroundings caused significant differences to the ambient ozone concentrations from sensors located across Beijing. Second, the sensors successfully showed that indoor ozone concentrations were likely to be lower when air filtration was on compared to the concentrations when filters were off. Moreover, the results confirmed higher levels of ozone outdoor concentrations compared to indoor. After calibration, average indoor O3 concentration ranged -2 ppb to 23 ppb, while outdoor O 3 concentration was from 19 ppb to 47 ppb. The only personal sensor that worked well measured the average personal exposure as about 33 ppb. The peak of ozone outdoor concentration was usually 100 ppb higher than indoor concentration.
520 $a Several factors were considered that could affect the accuracy of the sensors including temperature (degree C), relative humidity (RH%), and concentrations of other chemicals in the ambient environment such as Nitrogen Oxides (NO 2, NO). However, the impacts of those factors on the performance of sensors were not significant after calibration with little or no correlation between errors and those factors. Therefore, the calibrations based on the simple linear regressions between the sensors and the reference when collocated were valid on the data during the whole sampling period.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Environmental engineering. $3 557376
655 7 $a Electronic books. $2 local $3 554714
690 $a 0775
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Duke University. $b Civil and Environmental Engineering. $3 1181683
773 0 $t Masters Abstracts International $g 56-05(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10259518 $z click for full text (PQDT)