Rainfall

Damp spaces and buildings are more susceptible to mold contamination which causes air quality problems.
These environments can lead to problems related to asthma and trigger pneumonia and respiratory syncytial virus (RSV)
Since standing water is one of the necessary environmental habitats for mosquitoes, floods could increase the diseases transmitted by mosquitoes such as dengue, malaria, and West Nile Virus.

Wildfires and dust storms lead to lower air quality values due to increased particulate matter in the air.
Droughts can aggravate extreme heat events.
Dry conditions can also lead to flash floods due to heavy rainfall and the inability for the soil to absorb runoff.
Lack of rainfall can cause an increase in certain water-borne disease within ground and surface water supplies, such as E. coli and Salmonella.