The phrase "at unusually low levels" is correct and usable in written English.
It can be used to describe a situation where something is present or occurring at a level that is lower than what is typical or expected.
Example: "The water quality in the lake has been reported at unusually low levels, raising concerns among environmentalists."
Alternatives: "at abnormally low levels" or "at significantly low levels".
With interest rates at unusually low levels, this appears to be an attractive alternative.
The share of adults in the work force remains stuck at unusually low levels — under 63percentt in November.
Our Record Of American Democracy (ROAD) data include election returns, socioeconomic summaries, and demographic measures of the American public at unusually low levels of geographic aggregation.
Capacity utilization of chip plants is at unusually low levels as customers work their way through inventories that surged in late 2008 and early 2009.
As a result, it has benefited so far from a huge bond-buying program undertaken by the Bank of England — proportionally, the largest in the world — that has kept mortgage rates and gilt yields at unusually low levels.
Interestingly, the volatility of volatility is currently at unusually low levels, which means that volatility is likely to pick up again soon.
Transcript levels deviated more for longer genes than for shorter genes, and northern blotting of the samples taken at the affected time points showed unusually low levels of long, for example var length, RNA, confirming that the cause was not PCR error but most likely an as yet unidentified artefact of RNA preparation.
The open access early years centre setting certainly presented challenges including the contamination of the control group due to the ready availability of parenting support, and unusually low levels of attendance at the programme.
At the opposite end of the spectrum, unusually low levels of haloperidol in plasma were seen in B6 mice, yet these mice still showed a significant drop in activity.
The downpours of the last month have restored flow levels in many rivers – in half the sites monitored by the agency, flows which had dropped to unusually low levels by March are now at levels which are notably or exceptionally high.
Prkg1SMr mice showed unusually low levels of EEG delta power at sleep onset (i.e., light onset) when sleep need and EEG delta power in mice tend to be highest (see control mice in Fig. 3A).
