(1) The character and degree of injury to, or interference with, the protection of the health, general welfare and physical property of the people;
(2) The social and economic value of the air contaminant source;
(3) The suitability or unsuitability of the air pollution source to the area in which it is located. In this respect it is expressly anticipated that the board may establish zones and categories of air contaminant sources in which the standards, rules and regulations may differ according to zone and category of air contaminant source;
(4) The technical practicability and economic reasonableness of reducing or eliminating the emission of such air contaminants;
(5) The economic benefit gained by the air contaminant source through any failure to comply with this part and regulations promulgated thereunder; and
(6) The amount or degree of effort put forth by the air contaminant source to attain compliance.