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The Household Air Pollution Intervention Network (HAPIN) Trial is an international multi-center study aimed at assessing the impact of a liquefied petroleum gas (LPG) cooking stove and fuel intervention on health. HAPIN Trial centers are located in four countries: Guatemala, India, Peru and Rwanda.

Omphi 1

(Image: Delivering an LPG tank in Guatemala. Photo: Andrea Bruce).

Each centre is recruiting 800 pregnant women where they are randomly allocated either a LPG stove and 18 month free supply of LPG, or to the control arm where they receive behavioural reinforcements.

Pregnant women are followed up during their pregnancies and until their child is one year old. Older women in the study households are also enrolled and followed up during the same period. The primary objectives are low birth weight, pneumonia and stunting the children and high blood pressure in older women.

The primary role of the Oxford group in this study is to investigate the impact of air pollution on fetal growth during pregnancy using the ultrasound data. For more information please see visit the study website

Funding: National Institutes of Health (NIH) and the Bill & Melinda Gates Foundation.

Omphi 2


(Image: Study sites participating in the HAPIN trial).