bronchodilator

Is it necessary to dilute albuterol/ipratropium with

normal saline?

The eCPS says:

"Dilution Instructions: If necessary, before use, doses may be diluted to a total nebulization volume of 3 to 5 mL with preservative-free 0.9% sterile sodium chloride solution and used immediately."

What is "if necessary....may be diluted"?

Is it okay to give it by nebulizer without being diluted?

I've had both of those drugs in forms where I had to dilute them and in forms where they were premixed. Does is day on the packaging what % is drug (vs saline?)