What is this upside-down transparent funnel-shaped item on a weather monitoring station? I snapped this photo with my cell phone at a fishing harbor in northern Taiwan.

I recognize a weather vane + anemometer, and I suspect the two large, dark things at the tops of poles might be omnidirectional antennas, but the item near the right shaped like an upside-down funnel at the end of a u-shaped tube appeared to be transparent, as if glass or plastic.

I've never seen anything like it. Any thoughts?
The upside down funnel-shaped attachment is used to prevent rain-water getting inside the inlet of instruments which analyse ambient air. Usually, these instruments are air pollution monitoring instruments like ozone analyser, carbon monoxide analyser, particle concentration analyser, etc.

One may think why can't just use U-shaped tube (inlet). In case of U-shaped inlet, rainwater falling on inlet will eventually roll down near the entrance and will be pulled in with air due to strong flow. Funnel shape will have smaller flow near the wider opening and prevents water from getting into the air stream.