A monkey scales a wall as air pollution engulfs the Kathmandu Valley in Kathmandu, Nepal, 07 April 2024. Nepal's capital Kathmandu is ranked among the world's most polluted cities, with PM2.5 levels reaching 169 micrograms per cubic meter on 07 April, according to IQ AirVisual, a Swiss group that collects air-quality data daily from around the world. (Photo by Narendra Shrestha/EPA)
