The phrase "a certain quota" is correct and usable in written English.
It can be used when referring to a specific, but not precisely defined, amount or limit that is required or expected in a particular context.
Example: "The organization has set a certain quota for the number of volunteers needed for the event."
Alternatives: "a specific quota" or "an assigned quota".
It's in the nature of sf that a reader may forgive much for a certain quota of conceptual invention.
Meanwhile, 25 states now have laws that require utilities to obtain a certain quota of the power they sell from renewable resources.
Employees had to meet a certain quota or they were sent to remedial training, she said, and if their performance did not improve, they were fired.
The European Union has operated its Emissions Trading System since 2005, requiring large polluters like cement manufacturers, steelworks and electricity utilities to hold a certain quota of permits to emit greenhouse gases.
Developers have a certain quota of art they have to include in a building, but those at 140 have deliberately exceeded it, making it one of the most interesting – and attractive – buildings in the city.
The men all had beards; a female candidate (each party is mandated by law to include a certain quota of women on their party lists) was represented by a pair of butterflies, because the party considered it unseemly to have a picture of a women.
One could argue that M2 was compensating for the absence of M1 – however, the large day-to-day fluctuations in the total amount of guarding (Supplementary material 2) are not compatible with the notion that there is a certain daily "quota" of guarding.
During the beta test period, the AdWords API was free for all but only within certain quota limits.
Payments for simply using a product or achieving certain quotas are ethically indefensible, as are payments where a role is being remunerated which appears tokenistic, for example in some cases where surgeons act as consultants or spokespeople.
And when your only payment for work is possibly getting a day off for meeting certain quotas, there isn't much reason not to cut corners.
European governments asked the European Commission in July to look into how the banana market could be managed first come, first served, with licenses to import bananas awarded within certain quotas to those in a position to bring their bananas to Europefirst.
