I love in a block of flats and new tenants downstairs cooking smells are coming up and making me I'll. Lots of fish and mutton smells. I have air fresheners and cooking smell elimination cancels all over but nothing works. It starts from 8 am to past midnight everyday

So complain to the council.

There is little we can do here in the United States.

Maybe you both could benefit from better air circulation. Many years ago I found that those air fresheners and candles triggered my allergies and made me miserable. I did better with scented wax melted in an electric wax melting pot, and scented oils used with a humidifier.

Maybe this site can help.

https://thenaturalpenguin.com/homemade-natural-air-fresheners/

How about talking with them nicely? And or talk with the council?