A study has discovered a correlation between childhood exposure to air pollution and the onset of menstruation in girls.

Once labelled the world's dirtiest city by the UN in 1992, Mexico City has been making strides towards a greener future. Over the past 20 years, initiatives like "No-Drive Days" and a robust bike-sharing system have been introduced.

Air pollution is a grave environmental and public health concern in India, and the state of Bihar is no exception.