Cordless Mosquito Sprayer for Evacuation Centers and Temporary Shelters: When the Power Is Out, the Hall Is Crowded and Floodwater Brings Mosquitoes, AIROSTAR Is the Answer

A disaster does not end when people reach safety. In a shelter where hundreds of evacuees sleep side by side, electricity is unreliable, water pools around the building and mosquitoes multiply quickly, the risk of vector-borne disease follows quietly. This article explains why local governments, disaster prevention and mitigation units and public health teams should keep a portable, battery-powered ULV mosquito sprayer in their emergency preparedness kit.

The Third Night at the Riverside School Shelter (illustrative scenario)

Prasert is the chief administrative officer of a Subdistrict Administrative Organization in central Thailand. When the river overflows into five riverside villages at once, he is told to open a temporary shelter in the multipurpose hall of the subdistrict school. Within two days, more than three hundred evacuees have moved into a single building: bedridden older people, small children, pregnant women and people with chronic illnesses who must keep taking their medicines.

Power in the subdistrict is cut on and off for safety. The shelter has one small generator, which must run the lights, a few fans, a refrigerator holding insulin and the phone chargers evacuees need to reach their families. Rainwater collects in old tires behind the canteen, in flower pots and in the containers people carried from home. By the third night, the whine of mosquitoes fills the hall. Children cry from bites, older people cannot sleep, and a village health volunteer reports that two children have started running a fever.

Prasert calls the head of the administrative office to request a mosquito fogger from the organization's store. There are two petrol thermal foggers. One is underwater in a flooded warehouse. The other works, but its thick smoke and loud engine make it unsuitable for a hall packed with sleeping people, and fuel is scarce because the roads are cut.

His problem is very clear. He needs a mosquito sprayer that does not need a socket or fuel, that one person can carry, that can reach corners around the building, the temporary toilets and the rubbish point, and that can go on a boat to treat houses where families are still living on the upper floor.

Why Shelters Are High-Risk Places for Mosquito-Borne Disease

1. Health risk: crowding, stress and new breeding sites

After floods and storms, standing water appears everywhere: in containers, tires, debris and puddles around buildings. Aedes mosquitoes lay eggs in fairly clean still water, while Culex nuisance mosquitoes prefer dirtier water. When many evacuees sleep together without enough bed nets, mosquitoes find hosts easily. If even one person in the shelter has dengue, Aedes mosquitoes that bite that person may pass the virus to others before long.

Dengue causes a persistent high fever, headache and body aches, sometimes small bleeding spots, and in severe cases shock. Aedes mosquitoes also carry chikungunya, which causes intense joint pain, and Zika, a particular concern for pregnant women. In forest or border areas, Anopheles mosquitoes carry malaria. The most vulnerable people in any shelter are young children, older adults, pregnant women and people with chronic diseases, who are usually the first to be evacuated.

Mosquitoes are not the only threat. Flies swarming around rubbish and temporary toilets spread gut infections such as diarrhea, which are common after disasters when waste management and sanitation break down. Insect control in a shelter must therefore look at the whole picture and aim to eliminate all kinds of insects that carry disease, not mosquitoes alone.

2. Budget risk: a second emergency on top of the first

During a disaster, budgets go to food, drinking water, medicines, boats and repairs. If a dengue outbreak breaks out inside a shelter, the agency must also pay for treatment, patient transfers over damaged roads and outbreak control, all of which cost far more than prevention. A ready-to-use mosquito sprayer in the preparedness kit is a sensible investment in prevention.

3. Reputation risk: every camera is on the shelter

In a disaster, the public watches government agencies closely. Journalists and evacuees post photos and videos from shelters constantly. A picture of a child covered in bites, or news that evacuees caught dengue in a shelter, can overshadow all the hard work of the staff. On the other hand, the sight of officers spraying systematically every morning and evening signals good management and reassures evacuees.

4. Workload risk: staff and volunteers are overwhelmed

Local officials and volunteers work almost around the clock during a disaster: registering evacuees, distributing supplies, caring for the sick and coordinating with other agencies. Any tool that requires fuel mixing, a long warm-up or a difficult start will always be left for later. The right tool for this situation must be ready to use instantly, usable by anyone after brief training, and must not add to the team's burden.

Why the Usual Tools Fail in a Shelter

Thermal foggers cannot be used in a hall full of sleeping people. A thermal fogging machine is ideal for wide outdoor areas, but a shelter is a hall with people lying on every square meter. Filling it with thick smoke means moving everyone out, which is unrealistic at night or in the rain. The engine also needs fuel, which is often scarce during a disaster.

Plug-in electric foggers have no power to plug into. Electric ULV machines are excellent in buildings with stable electricity, but shelter power is often cut or rationed, and generator output must be saved for essential equipment. Running long extension cables through wet floors and sleeping areas is also an electrical hazard.

Machines are flooded or neglected. Many agencies store their mosquito sprayers in ground-floor warehouses, so the equipment is damaged by the same flood. Machines left unused for months may simply fail to start when needed.

Relying on coils and aerosol cans. Handing out mosquito coils in a building with hundreds of people creates smoke and a fire risk. Aerosol cans hold little product, cannot cover large areas and are expensive per square meter.

Spraying without removing breeding sites. Killing adult mosquitoes while leaving water in containers around the shelter guarantees a new generation within one to two weeks. Spraying must always go hand in hand with emptying containers and clearing rubbish.

Cheap machines with no after-sales support. In an emergency there is no time to wait for parts from overseas. A machine without a local distributor and technicians is a risk no agency should accept.

The Solution: AIROFOG AIROSTAR Cordless Battery ULV Fogger

The AIROFOG AIROSTAR is a ULV cold fogger powered by a lithium-ion battery. It needs no power cable and no fuel, and it is supplied and supported by World Health Disinfection Co., Ltd. (WHD). Its core features match almost everything a shelter needs:

• Cordless lithium-ion battery: no dependence on building power while working, so staff can move freely inside, around the building and wherever there is no socket.
• Up to about 60 minutes per charge: enough for one full round of a medium-sized shelter. Charge it in advance while power is available, or from the generator when essential equipment is not drawing power.
• Spray reach of up to about 11 meters: reaches bushes, the space under raised buildings, drains and awkward corners without the operator wading into water or slippery ground.
• ULV mist: a small volume of product becomes a large number of fine droplets, with no heavy smoke and little wetting, so treated areas can be reused quickly.
• Portable and one-person operation: easy to load onto a pickup or flat-bottomed boat, or carry upstairs to families still living on the upper floor of their homes.

For mosquito control in shelters, staff use an insecticide registered with the relevant authorities at the rate on the label, treating around the building, temporary toilets, rubbish points and resting sites such as shrubs and shady corners. Inside sleeping areas, evacuees should move out of one zone at a time during treatment and the ventilation period on the label. Because a ULV mist produces no thick smoke, this zone-by-zone rotation is much easier to organize.

With a product suited to the target pest, the AIROSTAR also supports control of other insects common in shelters, such as flies around the kitchen and rubbish points that spread gut infections, so one machine covers several sanitation tasks.

WHD holds ISO and GMP certification, checks 100% of units before delivery, and provides technicians, spare parts and full after-sales service. The products meet Thai government equipment standards, so Subdistrict Administrative Organizations, municipalities and disaster units can buy with confidence for their preparedness stock.

10 Reasons the AIROSTAR Belongs in Every Disaster Preparedness Kit

1. No power or fuel needed while working. It keeps going when the grid is down and roads are cut, which is normal in a disaster.
2. Up to around 60 minutes per charge. Covers the morning and evening rounds of a medium shelter, and a spare battery extends the working time.
3. Reach of up to about 11 meters. Treat shrubs, underfloor spaces and standing water without wading in, reducing accidents among staff.
4. No thick smoke or flame. Less alarm among evacuees and no stinging eyes or coughing for children and older people.
5. No cables across wet floors. Lower risk of electric shock in buildings with standing water and heavy foot traffic.
6. Light and easy to transport. Use it at the main shelter and at smaller sites and homes where people remain.
7. ULV saves chemicals. Vital when delivering supplies is difficult.
8. Simple enough for volunteers. Switch on and start spraying, with no warm-up or fuel mixing.
9. Useful every day after the disaster. Treat schools, child development centers, offices and temples all year, especially where there are no sockets. Details on the AIROSTAR battery mosquito sprayer page.
10. Local distributor and service. WHD provides technicians, spare parts, training and a quality check on every unit.

A Mosquito Control Plan for Temporary Shelters, from Day One to Closure

Before the disaster: prepare the machine and the people. Store mosquito sprayers above flood level. Keep the AIROSTAR battery fully charged and check it monthly during the rainy season. Stock registered, in-date insecticide, personal protective equipment and treatment logs, and train at least two or three staff or volunteers per shelter so they can work in shifts.

Days 1 to 3: survey and break the cycle early. Walk the area around the shelter, empty or remove containers holding water such as tires, pots, paint buckets and foam boxes, cover water jars and drums, and set up covered rubbish points away from sleeping areas. Then mist around the building, shrubs, underfloor spaces, temporary toilets and rubbish points early in the morning and in the evening, when mosquitoes are most active.

Day 4 onward: routine rounds and zone-by-zone indoor treatment. Keep a fixed morning and evening outdoor schedule. Indoors, divide the hall by family or village group, move people to a common area, cover food, water and belongings, treat, wait for the label time, ventilate and let people return. Give bed nets to the most vulnerable.

When a suspected dengue case appears: move the patient to a netted area, alert the health team, treat the patient's zone and surroundings in line with the familiar guidance of treating within roughly 100 meters of a case, repeat larval surveys and monitor neighbors with village health volunteers.

Satellite sites and occupied homes: take the AIROSTAR by boat or pickup to temples, roadside pavilions and upper floors where families remain. Its reach lets staff treat under raised houses from the boat.

Recovery after the water recedes: this is when breeding sites peak. Promote the Department of Disease Control's familiar "3 keeps" message of keeping homes clean, clearing rubbish and covering water, and keep treating risk points until conditions return to normal.

Designing a Shelter Layout That Makes Mosquito Control Easier

Equipment works best when the shelter itself is organized with insect control in mind. A few simple layout decisions made on the first day can cut mosquito and fly problems significantly and make every round with the sprayer more effective.

Keep sleeping areas away from water and waste. Place sleeping mats and cots as far as possible from temporary toilets, washing points, the kitchen and rubbish collection. These are the places where water pools and flies gather, and they will need the most frequent treatment.

Leave walkways between family groups. Clear aisles let staff move through the hall with the sprayer during zone treatment, let people move out quickly, and reduce the chance of someone being missed when a zone is cleared.

Group the most vulnerable together near nets and staff. A dedicated corner for young children, pregnant women and older adults, equipped with bed nets and close to the medical point, makes it easier to protect them and to spot fever early.

Mark treatment zones on a simple map. Post a hand-drawn plan at the registration desk showing zones, the day and time of the next treatment and where people should wait. Clear communication reduces anxiety and keeps the schedule running.

Assign one person to breeding sites every day. A volunteer who checks and empties containers each morning, and reports new puddles after rain, turns spraying from a reaction into a routine. Record findings in the same log as spraying so the team can see whether mosquito numbers are falling.

Charge on a timetable. Agree fixed times when the generator can charge the AIROSTAR battery, for example late at night when fans and lights are off, so the sprayer is always ready for the early morning round.

Procurement Tips for Disaster Preparedness Mosquito Control Equipment

When buying government mosquito control equipment for disaster work, the key question is whether it will work when utilities are gone. Supply officers and specification committees may find these general points useful:

• Power source: specify a rechargeable battery ULV cold fogger that needs neither fuel nor building power during operation.
• Runtime and reach: set minimums that fit the size of your shelters, and consider buying spare batteries.
• Weight and portability: one person should be able to carry it and load it onto a vehicle or boat.
• Budget line: place it under the equipment category your parent agency specifies and include it in the local disaster prevention and mitigation preparedness plan.
• After-sales service: require local technicians, spare parts, a service center and a clear warranty.
• Training: require demonstrations and training on operation, battery charging and care, and rinsing for staff and volunteers.
• A mixed fleet: agencies covering large areas may combine a cordless unit for shelters with the AIROFOG AT35 thermal fogging machine for outdoor work after the water recedes and the SUPER ROTARY backpack ULV sprayer for village fieldwork.

See the full range on the government mosquito and insect control equipment hub.

Example Field Perspective

"During the flood, what we lacked most was not only food but electricity and fuel. A fogger that needs a socket or a jerry can was almost useless. With a battery unit, we charged it before the water arrived and used it the moment the shelter opened. We treated around the building morning and evening and even took it by boat to houses where people stayed upstairs. Evacuees told us they could finally sleep, and the team was less exhausted because nobody had to drag cables or carry fuel."

— A composite example based on the role of a local official running a temporary shelter, not a quote from a real person.

Frequently Asked Questions

1. How long does the AIROSTAR run on one charge?

Up to about 60 minutes, depending on use. For large shelters, keep a spare battery or more than one unit so work can rotate.

2. How do we recharge during a long blackout?

Charge fully as soon as a warning is issued. While the shelter is open, charge from the generator when essential equipment is not drawing power, or at a nearby agency that still has electricity.

3. Can we spray while people are sleeping in the hall?

No. Divide the hall into zones, move people out temporarily, cover food and water, treat, wait for the time on the label and ventilate before people return.

4. How is the AIROSTAR different from a thermal fogger?

A thermal fogger uses an engine and heat to make smoke and suits wide outdoor spaces. The AIROSTAR is a battery ULV fogger with no heavy smoke and no fuel, suited to crowded places without stable power.

5. What can we use it for after the disaster?

Mosquito control in schools, child development centers, offices, temples and public areas all year round, especially where there are no sockets, so it never sits idle in storage.

6. Does a mosquito sprayer treat dengue patients?

No. It is a vector control tool that reduces mosquito numbers and transmission risk. Anyone with fever must be assessed and treated by health professionals.

7. How do we request a quotation or a demonstration?

Contact WHD at 065-556-6294, LINE @whd268 or worldhealthdisinfection@gmail.com for specification details and a demonstration.

Prepare Before Disaster Strikes and Protect Evacuees from Mosquitoes

Talk to WHD about specifications, quotations, spare batteries and staff training.

View AIROSTAR Product and Price, Click Here

Browse All Government Mosquito Control Equipment

Tel 065-556-6294 · LINE @whd268 · worldhealthdisinfection@gmail.com

World Health Disinfection Co., Ltd., 88 268 Kanlapaphruek Road, Bang Khae, Bangkok 10160

Related Links

• Government mosquito and insect control equipment hub
• SOLO PORT423 backpack ULV sprayer
• AIROFOG AT35 thermal fogger
• Department of Disease Control, Ministry of Public Health
• WHO fact sheet: Vector-borne diseases