I am a Restaurant kitchen manager. I spend most of my 40 hrs a week inhaling airborne grease, and standing in front of 6 1700-watt microwaves at head level, in 120+ degree heat. What are the possible health risks of my job description?

microwave radiation is not dangerous, except in its ability to heat water (even water in your skin) you may develop dry skin. Also inhaling Acrylamide while cooking certain foods and if it will cause neurological problems or brain damage. Also, study commissioned by the Seattle P-I shows that top-selling butter substitutes, when heated, release vapor from a chemical additive called diacetyl. When inhaled, this vapor has been linked to a rare, sometimes fatal respiratory disease called bronchiolitis obliterans.
diacetyl vapors from some of the products are released in such volume that they could pose a significant risk to professional cooks who stand over hot grills or skillets for hours and use large amounts of these butter substitutes, according to the analysis.
There are many health risks to many to go into however, we all have to work for a living and there are health risks in almost every occupation. I have been exposed to asbestos dust in a carberator factory, silver nitrite, murcery, burning celluloid, and many other unhealty things over my 30+ years in machining. We are all going to die of something, but I sure like to eat, so thank you for your service in the food industry.
The good news is, Clouds and Angle wings golden streets and pearled gates are non-carcinogenic
God Bless

A thickened middle!

In addition to the previous answer... be wary of heat stroke, heat exhaustion, and heat stress. Heat stress is the sneakiest because it is cumulative over time. Depending on several factors, the amount of time it is safe to stay in that hot environment varies. Normally sufficient intake of water, not pop or other soft drinks, and a "rest time" is all that is needed to recover. As an example a ship's engine room may be 117degrees. The watch can stay for a maximum of 2 3/4 hours - then to avoid damage they have to get out of the space for at least the same amount of time they were inside. Again, this varies. Need someone with a WBGT meter to take a survey and determine your safe stay and recover times. WBGT =a special wet bulb, dry bulb thermometer.

Heat can kill, very quickly.