If we plot long term data of air pollutants and temperature, it shows opposite pattern. Few papers shows that high temperature triggers formation of secondary aerosol and pollution rises. On the other hand, convection of air creates better diffusion condition for pollutants and shows decreasing result. What are the reasons that we can address for the opposite relationship between air pollutant (PM2.5 & PM10) and air temperature? I would be very happy, if you suggest some related papers. Thank you. :)