Why the mighty Himalayas are getting harder and harder to see

Severe air pollution is obscuring visibility of the highest mountain peaks on Earth, hitting tourism hard.

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Each time I visit Kathmandu, I hope to catch a glimpse of the dramatic mountain range. But these days, there's usually no luck.

The main culprit is severe air pollution that hangs as haze above the region.

And it's happening even during the spring and autumn months, which once offered clear skies.

Just last April, the international flight I was in had to circle in the sky nearly 20 times before landing in Kathmandu, because of the hazy weather impacting visibility at the airport.