Household energy surveys typically occur a few times at most during a study. We deployed more frequent surveys — every couple of months in Jharkhand, every week for a couple of months in Bihar — to better understand household preferences and what impacts fuel use choices. Repeat phone surveys — whether weekly or monthly — provide important nuance on the dynamics of household energy use.

Strategies to measure area concentrations of and exposures to PM_2.5 in rural homes focus primarily on short-term measurements, often of 24 or 48 h. Little is known about how well these measurements, commonly used exposure metrics in health risk assessment of the impacts of household air pollution exposure, predict longer-term averages. We evaluate different combinations of measurement strategies in this paper, leveraging continuous monitoring in Guatemalan kitchens for 120-300 days.

Birthweight findings from the HAPIN LPG stove and fuel trial intention-to-treat analyses found an adjusted mean difference of 19.5 g (95% confidence interval, −10.1 to 49.2). Secondary analyses indicate a stronger effect amongst those who received the intervention earlier in pregnancy. Published in the New England Journal of Medicine.