"If the public becomes more aware of the environmental dangers of lead wheel weights and is given alternative wheel balancing choices then there will be a decrease in lead entering the environment." TEAM DEAD WEIGHT One liter of water at 4°C will weigh 1000 grams. The EPA safe limit for lead in any water is 15 PPB/Liter. If one liter of a solution contains 1 gram dissolved lead = 1000 milligrams dissolved lead = 1,000,000 micrograms dissolved lead which equals 1,000,000 PPB lead/Liter of water, divide 1,000,000 by 15 and you will have calculated that the one liter of solution containing 1,000,000 PPB lead is more than 66,666 times the USA EPA threshold acceptable limit of 15 PPB lead for one liter of water at 4°C. Using the same calculations, if a solution containing 1,000,000 PPB Lead/Liter was hypothetically and accidentally released into a water supply it could potentially contaminate 1,000,000 PPB/15PPB/Liter = 66,666.66 liters of water or more than 66,666 liters of water. *** 1 milligram(mg)/liter (1 PPM) =1000 micrograms(µg)/liter (1000 PPB) *** One gram of lead/liter = 1000 millgrams (1000 PPM)/liter = 1,000,000 micrograms (µ) (1,000,000 PPB)/liter A one ounce lead wheel weight weighs over 28 grams. 1 gram of lead(Pb)/Liter concentration in solution equals 1000 milligrams(mg) Pb/Liter = 1000 PPM Pb/Liter = 1,000,000 micrograms Pb/Liter = 1,000,000 PPB Pb/Liter Milligrams Per Liter (Parts Per Million) Micrograms Per Liter (Parts Per Billion) A part per million is equal to a milligram per liter. Parts per million (abbreviated ppm) is one part in a million parts. A part per billion is equal to a microgram per liter. 1 microgram in one liter of water = 1 microgram per liter or one part in a billion parts. A part per million is equal to a milligram per liter. Parts per million (abbreviated ppm) is one part in a million parts. Parts per million refers to a ratio of weights. One part per million is one pound in a million pounds, one ounce in a million ounces, one gram in a million grams, etc. Therefore: 1 ppm = 1 pound per million pounds, or, since 120,000 gallons of water = 1,000,000 pounds 1 ppm = 1 pound per 120,000 gallons of water To visualize a part per million (PPM), a penny weighs two grams. Imagine dividing that penny into 2 million parts. For that same penny,to visualize a part per billion (PPB), imagine dividing that penney into 2 billion parts. -------------------------------------------------------------------------------- Milligrams Per Liter Milligrams per liter also refers to a weight ratio. One milligram per liter is the same as one part per million when the reference volume is water because, 1 gram (weight) = 1,000 milligrams =1,000,000 micrograms and 1 liter of water weighs 1,000 grams at 4°C; therefore, 1 liter of water = 1,000,000 milligrams (PPM) (1,000 x 1,000) = 1,000,000,000 micrograms= 1,000,000,000 (PPB) so, 1 milligram in one liter of water = 1 milligram per liter or one part in a million parts PLEASE CLICK HERE FOR THE REFERENCE WEBSITE. 
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