"observe the impact" is a correct and usable phrase in written English.
It means to carefully watch or examine the effects or consequences of something. Example: The scientists carefully observed the impact of the new medicine on the patients' overall well-being.
Local managers could now observe the impact of their efficiency activities.
[Our] study does not have the resolution to observe the impact winter, which would only have lasted a few years at the most.
By imposing a freezing temperature at the probe-tumor boundary, we can observe the impact on healthy tissue over the freeze-thaw cycles of the surgery procedure.
But rarely, if ever before, have researchers been able to observe the impact of a change in income across such a large group.
In the field of manufacturing engineering, process designers conduct numerical simulation experiments to observe the impact of varying input parameters on certain outputs of a production process.
In a between-subjects design, we observe the impact of a substantial delay of risk resolution (2 days) on investment choices.
The objective of the investigation was to observe the impact of player wellbeing on the training output of elite soccer players.
An empirical model was analyzed to observe the impact of electric power prices on the selection of a liberalization model in the power sector.
One of the best places to observe the impact of Airbnb is New Orleans, where next week the city council will vote on a bill to regulate the short-term rental industry.
In the present paper, electropolishing behavior of different brass alloys (CuZn39Pb2, CuZn42) in phosphoric acid is studied to observe the impact of alloying elements on polishing quality.
To commemorate the 17th anniversary of 9/11, Paul Swenson said he planned to go to one of the 60 healing fields he helped organize, then quietly observe the impact.
