This photo taken on July 25, 2025 shows buildings shrouded in fog in Nairobi, Kenya. Thick fog blanketed Nairobi in the morning of Friday. (Xinhua/Han Xu)

Birds fly over fog-shrouded buildings in Nairobi, Kenya, July 25, 2025. Thick fog blanketed Nairobi in the morning of Friday. (Xinhua/Han Xu)

Vehicles and people are seen on a fog-shrouded street in Nairobi, Kenya, July 25, 2025. Thick fog blanketed Nairobi in the morning of Friday. (Xinhua/Han Xu)

This photo taken on July 25, 2025 shows buildings shrouded in fog in Nairobi, Kenya. Thick fog blanketed Nairobi in the morning of Friday. (Xinhua/Han Xu)

Construction workers operate in fog in Nairobi, Kenya, July 25, 2025. Thick fog blanketed Nairobi in the morning of Friday. (Xinhua/Han Xu)