Background: Machine-learning algorithms are becoming popular techniques to predict ambient air PM concentrations at high spatial resolutions (1 × 1 km) using satellite-based aerosol optical depth (AOD). Most machine-learning models have aimed to predict 24 h-averaged PM concentrations (mean PM) in high-income regions. Over Mexico, none have been developed to predict subdaily peak levels, such as the maximum daily 1-h concentration (max PM).
Objective: Our goal was to develop a machine-learning model to predict mean PM and max PM concentrations in the Mexico City Metropolitan Area from 2004 through 2019.
Methods: We present a new modeling approach based on extreme gradient boosting (XGBoost) and inverse-distance weighting that uses AOD, meteorology, and land-use variables. We also investigated applications of our mean PM predictions that can aid local authorities in air-quality management and public-health surveillance, such as the co-occurrence of high PM and heat, compliance with local air-quality standards, and the relationship of PM exposure with social marginalization.
Results: Our models for mean and max PM exhibited good performance, with overall cross-validated mean absolute errors (MAE) of 3.68 and 9.20 μg/m, respectively, compared to mean absolute deviations from the median (MAD) of 8.55 and 15.64 μg/m. In 2010, everybody in the study region was exposed to unhealthy levels of PM. Hotter days had greater PM concentrations. Finally, we found similar exposure to PM across levels of social marginalization.
Significance: Machine learning algorithms can be used to predict highly spatiotemporally resolved PM concentrations even in regions with sparse monitoring.
Impact: Our PM predictions can aid local authorities in air-quality management and public-health surveillance, and they can advance epidemiological research in Central Mexico with state-of-the-art exposure assessment methods.
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http://dx.doi.org/10.1038/s41370-022-00471-4 | DOI Listing |
Arthrosc Tech
November 2024
Ortopedika Hospital Hip Unit, Warsaw Poland.
Hip arthroscopy has been shown to be an effective surgical treatment with excellent outcomes and a low percentage of complications; however, there are published data regarding iatrogenic complications with hip distraction. Hip distraction is mandatory to gain access to the central compartment and to perform a reliable labral repair or labral reconstruction. Postless hip arthroscopy is very popular nowadays, and several techniques have been published.
View Article and Find Full Text PDFPain Manag
December 2024
Sports Medicine, Anahuac Mayab University, Mérida, Yucatan, Mexico.
Background: The aims of this review were to identify and to analyze the clinical studies that used subcutaneous injections of dextrose for treating musculoskeletal pain, in order to establish an overview.
Methods: A systematic search was carried out in scientific databases including Web of Science, Cochrane Central Register of Controlled Trials, PUBMED and other sources, up until March 2024. We included clinical studies that used subcutaneous injections of dextrose in the treatment of individuals with musculoskeletal pain associated with tendinopathies, enthesopathy, osteoarthritis, ligament sprains, muscle strains or bursitis of various locations.
Am J Otolaryngol
December 2024
Federal Hospital of Bonsucesso, Rio de Janeiro, Brazil.
Introduction: Intranasal mometasone and oral montelukast have been found to be effective for adenoid hypertrophy in children. We aimed to compare the efficacy of combination therapy of mometasone and montelukast versus mometasone alone for adenoid hypertrophy in children.
Methods: Following PRISMA guidelines, we systematically searched PubMed, Embase, Cochrane CENTRAL, and ClinicalTrials.
Kidney Int
December 2024
Department of Medical Statistics, London School of Hygiene & Tropical Medicine, London, UK.
The disadvantaged populations eGFR (estimated glomerular filtration rate) epidemiology (DEGREE) study was designed to gain insight into the burden of chronic kidney disease (CKD) of undetermined cause (CKDu) using standard protocols to estimate the general-population prevalence of low eGFR internationally. Therefore, we estimated the age-standardized prevalence of eGFR under 60 ml/min per 1.73m in adults aged 18-60, excluding participants with commonly known causes of CKD; an ACR (albumin/creatinine ratio) over 300 mg/g or equivalent, or self-reported or measured (HT) hypertension or (DM) diabetes mellitus, stratified by sex and location.
View Article and Find Full Text PDFEnviron Monit Assess
December 2024
Instituto de Geografía, Universidad Nacional Autónoma de México, Ciudad Universitaria, C.P. 04510, Coyoacán, Mexico City, Mexico.
This study aims to evaluate the changes in forest cover from 1994 to 2015, identify the key drivers of forest recovery, and predict future trends. Using high-resolution remote sensing data, we mapped forest canopy density into detailed categories (closed > 50%, open 10-50%, and deforested < 10%) to differentiate processes like degradation, deforestation, densification, reforestation, and afforestation. A multinomial logistic regression was used to explore the relationship between the forest processes and socioeconomic, proximity, planning, and policy potential drivers.
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