No abstract available.
Air Pollution, Indoor*

Background: Ironically, the hospital which is believed to be a healthy and safe place can be dangerous to health. Pollutants such as particulate matter 2.5 microns (PM₂.₅) can be present in hospital indoor air and may adversely affect the health of the hospital occupants. Objective: Possible sources of indoor PM₂.₅ in an urban tertiary care hospital in the Philippines are identified and apportioned in this study. Methods: PM₂.₅ measurements were conducted in two naturally ventilated wards (NVWs), two mechanically ventilated wards (MVWs), and a roof deck near the hospital. Mass concentrations with analytical uncertainties of thirteen elements (Al, Na, S, Si, Cl, K, Ca, V, Fe, Zn, Br, Hg, Pb) from PM₂.₅ measurements were utilized with Positive Matrix Factorization (PMF) receptor model to identify and apportion possible sources of indoor PM₂.₅. Results: In NVWs and MVWs, four types of sources were identified including sodium and chlorine sources, crustal emissions, anthropogenic sulfur sources, and road dust. Cleaning agents used in the hospital were identified as an anthropogenic indoor source of sodium while the other factors mainly came from outdoor sources. Conclusion The contribution of anthropogenic outdoor pollutants such as road dust and sulfur sources to indoor PM₂.₅ are highlighted in the study. The types of both indoor and outdoor sources of indoor PM₂.₅ can be influenced by the type of ventilation.
Respiration, Artificial ; Air Pollution, Indoor

The formulation and revision of the detection methods of indoor air quality standards is an important, rigorous and delicate endeavor. This paper introduced the formulation and revision of the detection methods of the standards for indoor air quality (GB/T 18883-2022), focusing on the revision process, revision principles, main adjustments and technical points of some key indicators to facilitate users to better understand and apply the detection methods in standards for indoor air quality (GB/T 18883-2022).
Humans ; Air Pollution, Indoor ; China ; Reference Standards ; Air Pollutants/analysis*

The formulation and revision of the detection methods of indoor air quality standards is an important, rigorous and delicate endeavor. This paper introduced the formulation and revision of the detection methods of the standards for indoor air quality (GB/T 18883-2022), focusing on the revision process, revision principles, main adjustments and technical points of some key indicators to facilitate users to better understand and apply the detection methods in standards for indoor air quality (GB/T 18883-2022).
Humans ; Air Pollution, Indoor ; China ; Reference Standards ; Air Pollutants/analysis*

Nitrogen dioxide (NO₂) is an important indoor air pollutant, with both outdoor and indoor sources contributing to indoor NO₂ exposure levels. Considering the association of high NO₂ exposure with adverse health effects, the Standards for indoor air quality (GB/T 18883-2022) have been revised to further restrict indoor NO₂ limit values. The 1-h average concentration limit value for NO₂ has been reduced from 0.24 mg/m³ to 200 μg/m³.This study analyzed the technical contents related to the determination of the limits of indoor NO₂ in Standards for Indoor Air Quality (GB/T 18883-2022), including source, exposure level, health effects, and the process and evidence basis for determining the limit value. It also proposed prospects for the direction for the implementation of the indoor NO₂ standard.
Humans ; Air Pollution, Indoor/adverse effects* ; Nitrogen Dioxide ; Air Pollutants/analysis* ; China ; Air Pollution/adverse effects*

Nitrogen dioxide (NO₂) is an important indoor air pollutant, with both outdoor and indoor sources contributing to indoor NO₂ exposure levels. Considering the association of high NO₂ exposure with adverse health effects, the Standards for indoor air quality (GB/T 18883-2022) have been revised to further restrict indoor NO₂ limit values. The 1-h average concentration limit value for NO₂ has been reduced from 0.24 mg/m³ to 200 μg/m³.This study analyzed the technical contents related to the determination of the limits of indoor NO₂ in Standards for Indoor Air Quality (GB/T 18883-2022), including source, exposure level, health effects, and the process and evidence basis for determining the limit value. It also proposed prospects for the direction for the implementation of the indoor NO₂ standard.
Humans ; Air Pollution, Indoor/adverse effects* ; Nitrogen Dioxide ; Air Pollutants/analysis* ; China ; Air Pollution/adverse effects*

Air Pollution, Indoor ; analysis ; China ; Environmental Monitoring ; Humans ; Surveys and Questionnaires

Air Pollution, Indoor ; analysis ; Environment, Controlled ; Humidity ; Radon ; analysis ; Temperature

Over half the world’s population is exposed daily to very high levels of household air pollutants arising from burning biomass fuels; however the effects of these pollutants on cardiovascular health have not been fully established. This study aimed to compare the relationship between household indoor and outdoor air pollution with cardiovascular health in biomass and non-biomass exposed group. To compare the relationship between household indoor and outdoor air pollution with cardiovascular health in biomass and non-biomass exposed group. This cross-sectional study compared parameters of cardiovascular health in populations exposed to household indoor pollutants from biomass burning and non-biomass respectively among adults in Nepal. Data using an interviewer administered questionnaire including chest pain, blood pressure measurements and real-time measurements of household and ambient airborne particulate (PM2.5) concentrations were collected. Rural dwellers cooking with biomass fuels reported significantly more chest pain on exertion compared with non-biomass fuel users. 24-hour direct PM2.5 and CO measurements were not associated with changes in blood pressure as was the case for other measures of airborne particulate exposure except outdoor PM2.5 with men in non-biomass using households. Ambient temperature and seasonality was negatively associated with increase in blood pressure. The prevalence of both systolic (21% vs. 6%, p<0.001) and diastolic (32% vs. 7%, p<0.001) hypertension was higher amongst non-biomass fuel users compared with biomass users. There was no association between 24-hour real-time airborne pollutants data from biomass smoke and cardiovascular health effects but significantly more chest pain on exertion was found in those exposed to smoke from biomass fuel burning. Urban dwellers in Nepal were found to have higher blood pressure compared to rural dwellers, which was associated with their higher BMI levels and seasonality.
Air Pollution, Indoor ; Cardiovascular Diseases ; Blood Pressure ; Hypertension ; Risk ; Nepal

OBJECTIVEbenzene; Air pollution; Risk assessment in the air of workshop and validate the methods.

METHODSExpert-reference, BAYES statistics and expert-measurement were separately used to estimate benzene concentration in a slurry-applying workshop and modeling workshop of a rubber factory. The estimations were compared with current newly monitored data.

RESULTSThe estimated averages of expert-reference, BAYES statistics and expert-measurement were 100.0, 16.9, 33.2 mg/m3 respectively for the slurry-applying workshop and 100, 156, 115 mg/m3 for the modeling workshop. No significant difference was observed between the estimations and validating sample except to that of the expert-reference for the former.

CONCLUSIONBAYES statistics and expert-measurement were precise and expert-reference was candidate if no measurements in spite of its subjectivity.