The phrase "an allowable level of" is correct and usable in written English.
It can be used when discussing permissible limits or standards in various contexts, such as regulations, guidelines, or thresholds.
Example: "The study established an allowable level of noise pollution to ensure the health and safety of residents."
Alternatives: "a permissible amount of" or "an acceptable degree of".
The Environmental Protection Agency EPAA) has set a lead action level of 15 ppb in drinking water, for example, and the FDA has set an allowable level for lead in bottled water of 5 ppb (EPA 1991; USFDA 1995).
The 1990 amendment to the U.S. Clean Air Act introduced sulfur emissions rights, a market for trading them, and a total allowable level of sulfur emissions.
Most notably, the reforms will lower a mine's allowable level of coal dust from 2.0 milligrams per cubic meter of air to 1.5, a move meant to force operators to better ventilate their mines.
Groundwater pumped from public-supply wells is not considered contaminated for the purpose of drinking until the allowable level of a contaminant has been exceeded.
Two days after the announcement, racing officials in Kentucky disclosed that a horse trained by Dutrow had tested positive for twice the allowable level of clenbuterol, a steroidlike medication that helps burn fat and promotes muscle growth.
And today the House overwhelmingly passed a measure that would increase the allowable level of tax-deductible contributions to individual retirement accounts and 401(k) retirement programs.
[C4.] House Passes Bill on 401(k) Plans In the latest action on big tax bills, the House overwhelmingly passed a measure that would increase the allowable level of tax-deductible contributions to individual retirement accounts and 401(k) programs.
A week later, on the same day the allegations about Asmussen surfaced in Texas, Kentucky racing officials suspended Dutrow for 15 days when one of his horses tested positive for twice the allowable level of clenbuterol, a bronchial dilator that helps burn fat and promote muscle growth.
In 2008, a horse trained by Dutrow that finished second in a $100,000 stakes race at Churchill Downs the day before Big Brown won the Kentucky Derby tested positive for twice the allowable level of clenbuterol — a drug that that helps burn fat and promote muscle growth — according to Kentucky racing officials.
Advertising claimed the product was "used by leading dentists throughout the UK and Europe", but tests showed it contained up to 110 times the allowable level of hydrogen peroxide, a bleaching agent.
