At this time of year (March) the dust from the plains of India make there way up to the the Himalaya. The monsoon then comes and clears this out in May and June. Giving you clear skys in September October.
Looks slightly different because it was covered in snow when I went this way, but I think this is the track along the lateral moraine heading from Pheriche to Duglha if I'm not mistaken? Aba Dablam in the background from a different view to normal?