It's not a description, it's a literal one.
The cool touch of the keyboard remained on his fingertips, and the weird smell of instant coffee and printer toner in the office still seemed to linger on the tip of his nose. But what enveloped him now was a hot, almost scorching moisture, and a strange smell mixed with the earthy smell and rotting vegetation.
"Fuck..." He wanted to curse out, but it felt like there was a lump in his throat.