From what you describe. It does not appear that you will change the attitude of the people you work with.
Find another line of work other than one that follows the protocol of using bleach to clean.
Also, being around negative people is certainly not helping you in aspect of your health and career.
As for your allergies. Try alternative medicine NAET and/or BRT. Body restoration technique with a chiropractor that does applied kenisology, AK.
Both methods are NON invasive and a higher level of accupunture without NEEDLES.
Very helpful for allergies and so much more.
Choosing a career and/or employee is something you have control over.
You also have control over your health . Healthy person, healthy life.