What kind of stand should I mount the pollen sensor on?

Although circumstances will vary from site to site, a non-penetrating square-based stand with a 2″x72″ mast (search the internet for “EZ NP-72-200”)  has been used frequently.

Note that a guy-wire kit, 2) pieces 14+ inches long of channel strut, related pole clamps and nuts and metal ground stakes are also recommended when using a mast that is not cemented firmly in the ground.