Common name:

 

Total Hydrocarbon (THC) refers to a wide range of molecules that consist of carbon and hydrogen (ex. Ethane, propane, benzene, etc.).  There are many classes of hydrocarbons based on molecular structure (ex. Polycyclic Aromatic Hydrocarbons (PAH)). Methane (CH4) is by far the most abundant hydrocarbon and is included in the THC measurement

 

What are their health effects?

 

High levels of hydrocarbons can cause irritation to the eyes and airways.  

 

What’s a safe amount?

 

The Occupational Safety and Health Administration has set an exposure limit of 500 parts of petroleum distillates (Hydrocarbon compounds) per million parts of air (500 ppm) for an 8-hour workday, 40-hour workweek. 

 

Where do they come from?

 

Hydrocarbons arise from natural processes such as the degradation of wood and plants.  Excess hydrocarbons may result from the industrial processing/burning of wood, coal, and oil.  

 

What does it smell like? Defining traits?

 

You won’t be able to “see” hydrocarbons, but you might be able to recognize when they are present.  Hydrocarbons are present in industrial smoke, cigarette smoke, car exhaust, and smog.

 

What can you do to protect yourself?

 

Avoid exposure to smoke and fumes.  If you know you will be in an area with high smoke and smog, try to cover your eyes, airways, and skin as much as possible.