I was looking into monitoring air quality and found that any affordable sensors aren't too accurate unless the air quality is really bad.
Is there a way i can use arduino and a small laser to measure the air quality?
You might want to specify the dynamic range you are looking for...
From my own position, all low cost (<$10,000USD) particle monitors are crap. MetOne has a lot of "low cost" monitors. The second problem is where you are using this sensor... a living room, workspace or clean room? If it is not a clean room, it will saturate and take hours to work properly.
A little scope can go a long way.