This is the 12496th most frequent Polish word.
najniższych
The Polish word "najniższych" means "the lowest" in English (genitive or accusative plural form).
Here 'najniższych' is the plural form in the genitive case, used to describe the comparison of levels.
Cena za produkt została ustalona na jednym z najniższych poziomów w historii.
The price for the product was set at one of the lowest levels in history.
In this context, 'najniższych' again qualifies 'notowań', referring to the lowest rankings or counts.
Liczba najniższych notowań populacji zwierząt wynosiła zaledwie tysiąc.
The count of the lowest population records of animals was merely a thousand.
'Najniższych' is used here in the plural form to modify 'sekcji', denoting the lowest sections.