How did the timing of continental carbon's release of carbon black, as well as this substances natural interaction with chemicals in the air, allow the company to continue to violate the clean air act for years after complaints were filed by citizens?

The Continental Carbon Company came to a settlement with the U. S environment protection agency (EPA) that the company will Reduce Air Pollution at Manufacturing Facilities in Alabama, Oklahoma and Texas. The company agreed to install air purification or air treatment units that will make the industrial emissions less harmful and acceptable for the environment. The company also agreed to pay a fine of $650,000