The conduct of COVID-19 vaccine trials in the context of a candidate vaccine being issued with Emergency Use Designation raises challenging ethical questions, including in relation to the use of placebo controls and unblinding of trial participants in current and future COVID-19 vaccine trials. This... policy brief was developed by the WHO Access to COVID-19 Tools (ACT) Accelerator Ethics & Governance Working Group, to provide guidance for researchers, sponsors, regulators, research ethics committees, and policy-makers, on these and related issues. more

Air pollution is one of the leading causes of health complications and mortality worldwide, especially affecting lower-income groups, who tend to be more exposed and vulnerable. This study documents the relationship between ambient air pollution exposure and poverty in 211 countries and territories.... Using the World Health Organization’s (WHO) 2021 revised fine particulate matter (PM2.5) thresholds, we show that globally, 7.3 billion people are directly exposed to unsafe average annual PM2.5 concentrations, 80 percent of whom live in low- and middle-income countries. Moreover, 716 million of the world’s lowest income people (living on less than $1.90 per day) live in areas with unsafe levels of air pollution, especially in Sub-Saharan Africa. Air pollution levels are particularly high in lower-middle-income countries, where economies tend to rely more heavily on polluting industries and technologies. These findings are based on high-resolution air pollution and population maps with global coverage, as well as subnational poverty estimates based on harmonized household surveys. more