This is the 9336th most frequent Russian word.
сырского
"Сырского" is not a standalone word but appears to be the genitive or adjectival form related to "Сырский," which could refer to a surname or something related to "сыр" (cheese). It depends on the context.
Here, 'сырского' refers to something related to or from a rural place, modifying 'сыра' (cheese) to mean 'cheese from the countryside'.
Я купил половину сырского сыра.
I bought half of the rural cheese.
'Сырского' as an adjective describes 'воздуха' (air), meaning air that has the qualities or essence typical of the countryside.
У него был запах сырского воздуха.
It had the smell of rural air.
In this sentence, 'сырского' modifies the noun 'мастера' (master or craftsman), indicating the master's rural origin.