Matches in SemOpenAlex for { <https://semopenalex.org/work/W4365150438> ?p ?o ?g. }
Showing items 1 to 49 of
49
with 100 items per page.
- W4365150438 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> We report on the long-term performance of a popular low-cost PM<sub>2.5</sub> sensor, the PurpleAir PA-II, at multiple sites in India, with the aim of identifying robust calibration protocols. We established 3 distinct sites in India (North India: Delhi, Hamirpur; South India: Bangalore), where we collocated PA-II with reference beta-attenuation monitors to characterize sensor performance and to model calibration relationships between PA-IIs and reference monitors for hourly data. Our sites remained in operation across all major seasons of India. Without calibration, the PA-IIs had high precision (Normalized Root Mean Square Error [NRMSE] among replicate sensors ≤ 15 %) and tracked the overall seasonal and diurnal signals from the reference instruments well (Pearson’s r ≥ 0.9) but were inaccurate (NRMSE ≥ 40 %). We used a comprehensive feature selection process to create optimized site-specific calibrations. Relative to the uncalibrated data, parsimonious least-squares long-term calibration models improved PA-II performance at all sites (cross-validated NRMSE: 20–30 %, R<sup>2</sup>: 0.82–0.95), particularly by reducing seasonal and diurnal biases. Because aerosol properties and meteorology vary regionally, the form of these long-term models differed by site. Likewise, using a moving-window calibration, we find a calibration scheme using seasonally specific information somewhat improves performance relative to a static long-term calibration model. In contrast, we demonstrate that a successful short-term calibration exercise for one season may not transfer reliably to other seasons. Overall, we demonstrate how the PA-II, when paired with a careful calibration scheme, can provide actionable information on PM<sub>2.5</sub> in India with only modest irreducible uncertainty." @default.
- W4365150438 created "2023-04-13" @default.
- W4365150438 creator A5074404241 @default.
- W4365150438 date "2023-04-12" @default.
- W4365150438 modified "2023-09-26" @default.
- W4365150438 title "Comment on amt-2023-35" @default.
- W4365150438 doi "https://doi.org/10.5194/amt-2023-35-rc1" @default.
- W4365150438 hasPublicationYear "2023" @default.
- W4365150438 type Work @default.
- W4365150438 citedByCount "0" @default.
- W4365150438 crossrefType "peer-review" @default.
- W4365150438 hasAuthorship W4365150438A5074404241 @default.
- W4365150438 hasBestOaLocation W43651504381 @default.
- W4365150438 hasConcept C105795698 @default.
- W4365150438 hasConcept C121332964 @default.
- W4365150438 hasConcept C165838908 @default.
- W4365150438 hasConcept C205649164 @default.
- W4365150438 hasConcept C2781162219 @default.
- W4365150438 hasConcept C33923547 @default.
- W4365150438 hasConcept C39432304 @default.
- W4365150438 hasConcept C61797465 @default.
- W4365150438 hasConcept C62520636 @default.
- W4365150438 hasConcept C62649853 @default.
- W4365150438 hasConceptScore W4365150438C105795698 @default.
- W4365150438 hasConceptScore W4365150438C121332964 @default.
- W4365150438 hasConceptScore W4365150438C165838908 @default.
- W4365150438 hasConceptScore W4365150438C205649164 @default.
- W4365150438 hasConceptScore W4365150438C2781162219 @default.
- W4365150438 hasConceptScore W4365150438C33923547 @default.
- W4365150438 hasConceptScore W4365150438C39432304 @default.
- W4365150438 hasConceptScore W4365150438C61797465 @default.
- W4365150438 hasConceptScore W4365150438C62520636 @default.
- W4365150438 hasConceptScore W4365150438C62649853 @default.
- W4365150438 hasLocation W43651504381 @default.
- W4365150438 hasOpenAccess W4365150438 @default.
- W4365150438 hasPrimaryLocation W43651504381 @default.
- W4365150438 hasRelatedWork W1972453760 @default.
- W4365150438 hasRelatedWork W1996972229 @default.
- W4365150438 hasRelatedWork W2017616014 @default.
- W4365150438 hasRelatedWork W2106995652 @default.
- W4365150438 hasRelatedWork W2116826719 @default.
- W4365150438 hasRelatedWork W2350270020 @default.
- W4365150438 hasRelatedWork W2366353390 @default.
- W4365150438 hasRelatedWork W2393070066 @default.
- W4365150438 hasRelatedWork W3122871200 @default.
- W4365150438 hasRelatedWork W4283580521 @default.
- W4365150438 isParatext "false" @default.
- W4365150438 isRetracted "false" @default.
- W4365150438 workType "peer-review" @default.