Many of those effects will be health-related. State and federal health authorities have warned residents to be on the lookout for mold in their homes, strange rashes on their bodies, stray jagged items in standing water that can lead to infected wounds, and depression and post-traumatic stress disorder as those affected try to stitch their lives back together.

Some of the dangers are obvious. For example, drowning is a top cause of hurricane-related fatalities. But there are some lesser-known health threats that Americans face.

Here are five of them:

Carbon monoxide poisoning.

After hurricanes, people often struggle without power for days or even weeks. Many people set up generators to provide much-needed electricity while they clean up their homes. But these generators emit odorless, colorless carbon monoxide, which is toxic to breathe, and experts say the gas poses a poisoning risk when the devices are used improperly.

Carbon monoxide poisoning accounted for 13 percent of all hurricane-related deaths in Florida in 2005, the Florida Health Department said in a report two years ago about the health dangers associated with hurricanes. Nine deaths after Hurricane Sandy in 2012 were blamed on the gas, and five nonfatal carbon monoxide poisonings were detected after Hurricane Katrina.

The Florida agency found that a noticeable spike in reports of carbon monoxide exposure in 2004 and 2005 among Florida residents probably was related to the intense hurricane activity during those years.

Chemicals.

The winds and storm surge that sweep onto the land during and after a hurricane can unleash dangerous chemicals, as floodwaters inundate industrial sites, overflow sewage and wastewater treatment facilities, and drench agricultural sites.

Dangerous substances can also spew into the air as a result of fires and other malfunctions. In Texas, for example, Hurricane Harvey damaged oil refineries and sparked a fire at a chemical plant in Crosby. Such incidents led to the release of more than 1 million pounds of dangerous air pollutants into the atmosphere in the week after the storm, according to public regulatory filings aggregated by the Center for Biological Diversity.

The Post’s Steve Mufson warned of the dangers facing the Turkey Point and St. Lucie nuclear plants in southern Florida – both of them opted to shut down before the storm hit.

But you don’t have to live near a chemical plant to be in danger – some of the most dangerous chemicals can come from a person’s garage. Damaged cars can leak battery acid and crude oil. Fertilizer and pesticides can spill from their containers, according to the Centers for Disease Control and Prevention.

Mosquitoes.

A lot of attention has fallen on the alligators, snakes and fire ants that were forced from their swampy abodes and into flooded back yards and living rooms during Hurricane Harvey. But the most fearsome creature to emerge from the storm may be the humble mosquito.

The annoying little critters are expected to proliferate as they breed in the waterlogged debris left over from the storm. There’s good news, at least at first, according to entomologists at Texas A&M: This first wave of “floodwater mosquitoes” will not carry any of the nasty diseases we associate with the bloodsuckers, including Zika and West Nile virus.

“Then as conditions dry up, we will cycle out of those weeks of floodwater mosquitoes, and then begin cycling into a period of time where the disease-transmitting mosquitoes will emerge and build up,” Sonja Swiger, a veterinary entomologist at Texas A&M AgriLife Extension Service, said a statement. “So, the initial run of mosquitoes is not too much of a disease threat — although a huge nuisance to people. But it’s the next run we really need to be concerned about.”

Chronic illnesses.

The aftermath of a hurricane can spark a variety of health problems, from respiratory illnesses caused by mold outbreaks to infected wounds. But a potentially larger problem for some people is the lack of access to medications and treatment for chronic conditions such as diabetes, asthma and kidney disease.

During Hurricane Katrina, 94 dialysis facilities were shuttered because of flooding or power loss, affecting nearly 6,000 patients, according to a November 2015 study in the American Journal of Kidney Disease. Patients on dialysis need the treatment three or four times a week to keep their bodies functioning.

Dialysis clinics reported long lines for care in Houston after Hurricane Harvey. Among the first to be evacuated from U.S. territories battered by Hurricane Irma last week were those needing the life-sustaining treatment.

Mental health.

It’s no surprise that natural disasters can traumatize people, so it perhaps follows that hurricanes can exacerbate mental illness.

A year after Hurricane Katrina, for example, residents reported an increase in suicidal thoughts and a worsening of post-traumatic stress disorder and depression, according to a 2015 paper published in the journal Nature.