You're not imagining it. Brisbane's mosquito problem is much worse than usual, even after Brisbane City Council's biggest December mosquito-reduction effort in more than 15 years.

Rain and tide events stretching from mid-November have caused mosquito populations to boom, especially in the city's north, and the outbreak isn't likely to end soon.

Mosquito control costs council $3.5 million a year.

The notorious salt marsh mosquito is the biggest problem for most residents because it carries Ross River and Barmah Forest viruses.

Council spends $3.5 million a year trying to constrain mosquito populations and sprayed almost 4400 hectares of public land last month alone - the largest December spray since 1998.