Enterprises A and B in the process of their activities produce two competing products and make emissions into the atmosphere, pre-passing the polluted air flow through the filter to purify emissions into the atmosphere. The cleaning efficiency today in both enterprises is 70%, there is an excess of permitted emissions. The equipment needs urgent modernization. There are several options for upgrading equipment. Under the implementation of the first option, the cleaning efficiency will increase by 10%, under the implementation of the second - by 8%, under the third option - by 12%. Offer each company the best option for the implementation of measures aimed at the modernization of treatment equipment, taking into account the actions of a competitor.