The following page of the game guide to Marvel's Spider-Man contains the description of the main mission titled "Harry's Passion Project".
It is time to present another type of side mission in the game. Reach Harry Osborn's research station and you will reveal all of the other stations located within the city. In the meantime, accept the "Snapping up Smog" quest, which you will find in the lab you are currently in.
Your task is to swing on the web and use this technique to pass through the clouds of smog marked on the map. The smog is located at different altitude levels, so try to look around and spot it in advance. You must reach eight clusters of smoke - it is not a difficult task, especially since you do not have to be concerned about time.
The next objective is to photograph three objects which are generating pollution: two cars and a large chimney. The side mission will then end in a success: you will gain a fast travel point and two Research Tokens. You will find many research stations on the map that will offer various missions - all of them have been described within the pages of this game guide, in their own respective chapters.