Thermal power plants will generate air pollutants

whose influence on the living environment is related to its time and space distribution characteristics. Based on the air quality index(AQI)of living environment

an index named AQI influence coefficient is introduced according to an analysis of the characteristics of generator pollutant emissions and diffusion. On the premise that the spare capacity during the maintenance period should meet the requirements of the guidelines

a method of determining the generator maintenance scheduling based on the ranking of AQI influence coefficient is proposed as is decomposition method of annual contract electric energy of thermal power generators by taking the existing monthly AQI distribution into account

which is able to optimize the AQI distribution of months with poor air quality while satisfying the assessment criteria for energy consumption. A numerical example shows that the proposed methods are simple and effective in optimizing the annual distribution of AQI contribution from thermal power while significantly reducing the air pollution in the months with poor air quality.