please help with these

2) Various chemicals are in use at a chemical plant. Air testing determines the air contains 2 ppm benzene, 40 ppm toluene & 150 ppm methanol. Assume these concentrations are steady throughout the day. Are the workers at the plants overexposed? TLVTWA Benzene Toluene Methanol 2.5 ppm 50 ppm 200 ppm