Persistent

in relation to an industrial chemical or its known environmental degradation products, has the meaning given by the Guidelines:

 Persistent means that any of the following apply to the industrial chemical:

• it has a degradation half-life (T½) in air of greater than or equal to 2 days, or 
• it has a degradation half-life (T½) in water of greater than or equal to 2 months, or 
• it has a degradation half-life (T½) in soil of greater than or equal to 6 months, or 
• it has a degradation half-life (T½) in sediment of greater than equal to 6 months.