The US has stopped sharing air quality data from its embassies worldwide, sparking concerns about the country's commitment to transparency and global leadership. This move has been met with criticism, with some arguing that it undermines the US's role in promoting democracy and access to information. The decision has also raised questions about the impact on public health and the environment. The US had previously shared air quality data from its embassies as part of its efforts to promote transparency and cooperation on environmental issues.