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Particulate polluting of the environment is often a mix of solid and liquid particles which are suspended up that you breathe. It is best to classify air particles from the aerodynamic properties as these properties determine the removal of them through the air, and where they deposit within your breathing. The main objective of the so named IR35 legislation is always to prevent contractors using the tax benefits associated with operating through their own personal company. This means people working via limited companies will be susceptible to exactly the same levels of tax as 'normal employees', using the appropriate degrees of taxes & national insurance.