Field measurements of indoor and community air quality in rural Beijing before, during, and after the COVID-19 lockdown.

The coronavirus (COVID-19) lockdown in China is thought to have reduced air pollution emissions due to reduced human mobility and economic activities. Few studies have assessed the impacts of COVID-19 on community and indoor air quality in environments with diverse socioeconomic and household energy use patterns. The main goal of this study was to evaluate whether indoor and community air pollution differed before, during, and after the COVID-19 lockdown in homes with different energy use patterns.

Personal Exposure to PM Oxidative Potential in Association with Pulmonary Pathophysiologic Outcomes in Children with Asthma.

Fine particulate matter (PM) with a higher oxidative potential has been thought to be more detrimental to pulmonary health. We aim to investigate the associations between personal exposure to PM oxidative potential and pulmonary outcomes in asthmatic children. We measured each of the 43 asthmatic children 4 times for airway mechanics, lung function, airway inflammation, and asthma symptom scores.

The impact of household air cleaners on the oxidative potential of PM and the role of metals and sources associated with indoor and outdoor exposure.

The health effects associated with human exposure to airborne fine particulate matter (PM) have been linked to the ability of PM to facilitate the production of excess cellular reactive oxygen species (oxidative potential). Concern about the adverse human health impacts of PM has led to the increased use of indoor air cleaners to improve indoor air quality, which can be an important environment for PM exposure. However, the degree to which the oxidative potential of indoor and personal PM can be influenced by an indoor air cleaner remains unclear.

The impact of household air cleaners on the chemical composition and children's exposure to PM metal sources in suburban Shanghai.

Increased public awareness of the health impacts of atmospheric fine particulate matter (PM) has led to increased demand and deployment of indoor air cleaners. Yet, questions still remain about the effectiveness of indoor air cleaners on indoor PM concentrations and personal exposure to potentially hazardous components of PM. Metals in PM have been associated with adverse health outcomes, so knowledge of their sources in urban indoor and outdoor areas and how exposures are influenced by indoor air cleaners would be beneficial for public health interventions.

The Oxidative Potential of Personal and Household PM in a Rural Setting in Southwestern China.

The chemical constituents of fine particulate matter (PM) vary by source and capacity to participate in redox reactions in the body, which produce cytotoxic reactive oxygen species (ROS). Knowledge of the sources and components of PM may provide insight into the adverse health effects associated with the inhalation of PM mass. We collected 48 h household and personal PM exposure measurements in the summer months among 50 women/household pairs in a rural area of southwestern China where daily household biomass burning is common.