Outdoor pollution: 1. moderate temperature, + 2. location without blowing wind, + 3. wet space= proper condition to hatch, for mosquitoes. Indoor pollution: 1. bright spots         2. long-lasting smell (good or bad),   3. the kitchen's sink- pipe that is connected to the sower system of the city. 

Dear Cécilia,

I have read a few things about this subject, mostly from the historical side:

There is for example a very interesting book by: Frank Snowden, The Conquest of Malaria: Italy, 1900-1962, Yale UP, 2006.

There is also a paper by Mauro Capocci in Passato e Presente:

http://www.francoangeli.it/Riviste/Scheda_rivista.aspx?IDarticolo=35364

Hope these references are useful to your research

Best regards

d.

Thank you very much Denis for this very helpful information.