Well, for those hanging onto using gas with TEL in your saws and 2-strokes, (ie., AvGas), the facts are that even low exposure over a longer period of time causes severe problems. The problem with lead exposure (even low lead level exposure) is that it accumulates in the body. If you are using a chainsaw with leaded gas, you are breathing in the TEL from the raw gas that 2-stroke engines all emit in the exhaust, unburned. You will absorb TEL from gas fumes from the exhaust that you inhale 3 feet from your face, as well as from any gas that you spill on your skin. Lead is associated with subtle and insidious toxic effects, even at low levels. Small levels of lead in your system can directly lower your IQ and cause antisocial behavior. As little as 1 μg/L (one microgram per liter) can drop your IQ by 4 points. Some interesting research has found that in the US and South Africa, approximately 30% of the decline in violent crime rates in both countries can be directly attributed to the removal of TEL from gasoline. TEL ia evil stuff, and it smells and tastes sweet to throw off your senses and make you think it is good stuff. It ain't. I do not know why any sane person would expose themselves to it. Of course some people that have been exposed to low levels of lead over longer periods of time may no longer be that sane...
