My cat keeps sniffling and sneezing lately?

well ever since spring came she has been sneezing,but this has never happened before.this is the first time that i've heard her do this.is it because of the pollen? i don't think it is because like i said, it never bothered her before.if it is the pollen,well i heard that this is the worst allergy season in years,so maybe it didn't bother her until now since it's supposedly the worst allergy season?? i don't know.answers please!!!