Construction sites are excellent mosquito habitat, with standing water in foundation pits, water drums, waste materials and temporary sumps — exactly what Aedes mosquitoes prefer.

Most contractors therefore keep a fogger on site, because they need to treat frequently and to respond immediately when neighbours complain.

But a construction site also destroys foggers faster than almost anywhere else, because extremely fine cement and construction dust blocks air filters many times faster than ordinary use. This is the true story of one site that learned it through two consecutive months of complaints.