to Haertig's recommendation of light, whistle and dust mask

you might consider...
make the mask an R95 or P95 for aerosols
lithium cell in the LED
eye protection... splash goggles or swim goggles
bottle of water to rinse eyes, rehydrate
handi wipe to decontaminate skin if necessary
alternate shoes to heels
battery pack to charge cell phone
small AM/FM radio for situational awareness
cash in small bills
multi tool
work gloves
window breaking punch
non adherent telfa pads, roll of Kerlix (to pack wound if necessary), roll of Coban stretch adhesive tape, ACE bandage, irrigation syringe

for the office a small "wonder tool" prybar with a notch that can break a chain link fence...small hacksaw...