What was recalled
In early February 2019, the U.S. Consumer Product Safety Commission (CPSC) announced a significant safety recall involving specific power supply units manufactured by PurpleAir LLC. This action was taken to address serious safety concerns associated with these electrical components, which are critical for powering PurpleAir’s air quality monitoring devices. The recall is not a blanket condemnation of all PurpleAir products but focuses specifically on the external power adapters that come bundled with certain models of their PA-II and PA-II-SD air quality sensors. These sensors are widely used by homeowners and community groups to monitor outdoor air quality, making the reliability and safety of their power sources paramount for public trust.
The specific items subject to this recall are power supply units bearing the model number RKPO-UL052000C. Consumers can identify these exact units by looking at the bottom side of the black power adapter, where a white label displays this crucial model number. The physical characteristics of the affected adapters are quite distinct: they measure approximately 4 inches in length (including the mounting tabs), 1-7/8 inches in width, and 1-3/8 inches in height. Visually, they present as black boxes with white labeling, designed to plug into standard wall outlets while connecting to the sensor via a cable. It is important for consumers to verify this specific model number, as other PurpleAir power supplies may not be included in this particular safety notice.
PurpleAir has acknowledged that 27 reports were received regarding these recalled power supplies exhibiting hazardous behavior, including emitting sparks and/or smoke. These incidents resulted in property damage in 18 of the reported cases, with one instance involving a small apartment fire. Despite the alarming nature of these reports, no injuries have been documented to date. The recall was officially dated February 14, 2019, indicating that the issue has been recognized for several years, yet it remains vital for current owners to take action. If you purchased a PurpleAir PA-II or PA-II-SD sensor kit during the time these power supplies were distributed, there is a possibility your unit contains one of the affected adapters. The company urges immediate verification and cessation of use for any units matching the described specifications to prevent potential fire hazards.
The hazard, explained
At the heart of this recall is a failure in the power supply units that accompany certain PurpleAir air quality sensors. Specifically, the issue lies with the black adapters featuring white labels, identified by model number RKPO-UL052000C. These devices are designed to convert standard electrical current into the lower voltage required to run your outdoor sensor. However, in this specific batch, the internal components of these power supplies can overheat during normal operation. This is not merely a case of the device becoming warm to the touch; it is a significant thermal runaway where the adapter generates excessive heat beyond its safe design limits.
When an electrical component like a power supply overheats, it creates a dangerous chain reaction. The intense heat can cause the internal wiring insulation to melt or degrade, leading to short circuits. According to reports from PurpleAir, this short-circuiting has resulted in the emission of sparks and smoke. Sparks are particularly alarming because they are visible, burning fragments of metal that can ignite nearby combustible materials such as dry leaves, wooden siding, or fabric. The smoke indicates that plastic housings or internal insulating materials are literally burning, which not only poses a fire risk but also releases potentially harmful fumes into the air you are trying to monitor.
The severity of this hazard is underscored by the data collected so far. PurpleAir has documented 27 incidents involving these specific power supplies. Among these reports, 18 involved property damage, ranging from scorched surfaces to more serious structural issues. One particularly disturbing report details an incident that escalated into a small apartment fire. While no injuries have been reported to date, the potential for physical harm is real and immediate. Burns can occur if a person touches the overheated unit, and smoke inhalation or fire spread poses significant risks to health and safety.
It is important to understand why this matters even if you believe your device is "fine." Electrical fires often start silently. An overheating power supply may not show obvious signs of failure until it is too late. The fact that these units are used outdoors might lead some to assume they are safe due to ventilation, but the accumulation of heat within the sealed internal components can still reach critical temperatures regardless of the external environment. This recall highlights a critical flaw in the electrical safety design of this specific model, making immediate action necessary to prevent potential fire and burn hazards.
Who is most at risk
The primary group affected by this recall consists of homeowners and renters who have installed PurpleAir PA-II or PA-II-SD air quality sensors in their outdoor environments. These devices are typically mounted on exterior walls, under eaves, or on balconies to monitor local air quality conditions. Because the power supply units are an integral part of the sensor’s operation, anyone who purchased these specific models and relied on them for continuous environmental monitoring is directly involved in this safety issue. The risk is not limited to a single demographic but spans all users of these particular sensors, regardless of age or location, provided they own the specific black power adapter with the white label.
While the hazard itself—overheating that can lead to sparks and smoke—is dangerous for anyone nearby, certain individuals may face heightened vulnerability due to their proximity to the device or their physical ability to respond to an emergency. Children are particularly at risk if the sensor is installed in areas they frequent, such as near a playground, a porch swing, or a ground-level window. If the power supply emits sparks or ignites, young children may not recognize the early signs of electrical failure, such as a burning smell or faint smoke, and might not know how to safely alert an adult or evacuate the area quickly.
Elderly individuals or those with mobility challenges may also be disproportionately affected if the sensor is installed in a location that becomes a trap during a fire. For instance, if the unit is mounted near a primary exit route or in a confined outdoor space like a small balcony, the resulting smoke or fire could hinder escape. Furthermore, because the recalled units have been linked to property damage, including apartment fires, residents of multi-unit housing complexes face unique risks. In these settings, a fire starting from an external power supply can spread rapidly to shared walls or vents, endangering not just the owner of the sensor but also neighbors who may be sleeping or unaware of the developing threat.
Additionally, people with respiratory conditions are at a secondary risk. While the sensors are designed to monitor air quality, a malfunctioning unit that is burning or emitting smoke introduces hazardous particulates and toxic fumes into the immediate environment. For individuals with asthma, COPD, or other lung sensitivities, inhaling smoke from an electrical fire can trigger severe health episodes, even if they are not directly burned by the heat. Therefore, the risk extends beyond physical injury to include respiratory distress for those with pre-existing health conditions.
Finally, it is important to note that no one should feel blamed for owning this device. The manufacturers were unaware of the defect until reports came in. However, because the hazard involves fire and burn risks, every user must take immediate action to remove the danger from their home environment, ensuring that all potential victims—whether children, elderly relatives, or neighbors—are protected by discontinuing use right away.
How to tell if you have the recalled item
If you own a PurpleAir air quality sensor, particularly one designed for outdoor monitoring, it is important to verify whether your specific power supply unit is part of this recall. Because the issue lies specifically with the electrical adapter rather than the sensor itself, identifying the correct component requires a close look at the physical characteristics of your equipment. This step is crucial because not all PurpleAir sensors use the same type of power adapter, and the safety risk is isolated to a specific batch of units.
The primary identifier for this recall is the model number printed on the power adapter itself. You need to locate the black power supply unit that plugs into your wall outlet and connects to your PurpleAir PA-II or PA-II-SD air quality sensor. Turn the adapter over so you are looking at its bottom side. On the white label attached to this surface, look for the specific model number RKPO-UL052000C. If your adapter bears this exact model number, it is part of the recalled group and must be removed from service immediately. Do not rely on the model number of the air sensor unit; the recall applies specifically to the power supply with the code listed above.
In addition to the model number, you can confirm whether your adapter is affected by checking its physical dimensions and appearance. The recalled adapters are distinctly black in color and feature a white label containing product information. When measured physically, these units are 4 inches long (this measurement includes any mounting tabs on the ends), 1-7/8 inches wide, and 1-3/8 inches high. If your power supply matches these dimensions and color scheme but does not have the specific model number RKPO-UL052000C, it is likely not part of this particular recall. However, if the model number matches, the physical size serves as a secondary confirmation that you are dealing with the correct product.
To ensure accuracy, please inspect every power adapter connected to your PurpleAir devices. Since these sensors are often used outdoors to monitor air quality, they may be installed in various locations around your home or property. Check each unit carefully by reading the white label on the bottom of the black adapter. If you find the model number RKPO-UL052000C, stop using the device right away and contact PurpleAir for instructions on obtaining a safe replacement.
What to do — step by step
If you own a PurpleAir power supply unit that matches the description in this recall, your immediate priority is simple: stop using it right now. The hazard here isn’t theoretical; PurpleAir has already documented 27 specific reports of these adapters emitting sparks and smoke. While no injuries have been reported yet, one incident involved a small apartment fire, which underscores how quickly a minor electrical fault can escalate into a serious home safety crisis. Therefore, do not wait for the device to fail visibly or smell burning before acting. Treat this as an urgent precaution. Unplug the power adapter from the wall outlet immediately. If it is currently connected to your PurpleAir PA-II or PA-II-SD air quality sensor, gently disconnect it from the sensor as well. Once disconnected, leave the unit alone. Do not attempt to open the casing, test it again later, or try to repair it yourself. These power supplies are sealed units, and tampering with them could expose you to live electrical components or further damage the already compromised internal wiring.
The next critical step is to initiate the recall process by contacting PurpleAir directly. The company has established specific channels for this purpose because they need to track exactly how many units are being returned to ensure safety across the entire batch. You can reach their support team toll-free at 800-474-0696. Please note that these agents are available from 9 am to 5 pm Mountain Time, Monday through Friday, so plan your call accordingly to avoid leaving a voicemail if you prefer immediate assistance. Alternatively, you may send an email to powersupplies@purpleair.com or visit their dedicated recall page at www.purpleair.com/recall for more information. When you contact them, be ready to provide the model number of your power adapter, which is RKPO-UL052000C. This number is located on the white label on the bottom side of the black adapter. Having this information ready will help the support team verify that your specific unit is part of the recall batch and expedite your replacement.
Once you have contacted PurpleAir, follow their instructions carefully to obtain a replacement power supply. The remedy for this recall is not a refund, but rather a free replacement of the defective component. This is important because you will need to replace the power adapter to continue using your air quality sensor safely. Do not purchase a third-party charger to use in the meantime, as it may not meet the same safety standards or specifications required by the PurpleAir sensor. Wait for the official replacement to arrive and install it according to the new instructions provided. By taking these steps, you are not only protecting your home from potential fire and burn hazards but also ensuring that your air quality monitoring equipment remains functional and reliable without risking further electrical damage.
Your refund, repair, or replacement options
When a safety recall involves a component as critical as a power supply—especially one linked to fire hazards—the manufacturer’s primary goal is to remove the dangerous item from your home and replace it with a verified safe version. In this specific case involving PurpleAir, the remedy provided by the company does not focus on financial reimbursement in the traditional sense. Instead, the official recall notice explicitly states that consumers should contact PurpleAir for instructions on how to obtain a replacement power supply. This means your primary option is a repair or replacement of the defective part, rather than a refund of the original sensor purchase. It is important to keep this distinction clear: you are not returning the entire air quality monitoring system for cash back; you are sending in or discarding the faulty adapter and receiving a new, safe one to restore your device’s functionality.
The process begins with reaching out to PurpleAir directly. The company has established specific channels to handle these requests efficiently. You can call their toll-free number at 800-474-0696. When you call, please remember that their support team is available from 9 am to 5 pm Mountain Time, Monday through Friday. If you prefer written communication or need to provide detailed information about your unit without waiting on hold, you can send an email to powersupplies@purpleair.com. Alternatively, you may visit their dedicated recall page at www.purpleair.com/recall for further instructions and updates. These are the only official contacts you should use; do not attempt to return the item to a third-party retailer or general customer service line that does not specialize in this specific technical recall.
Why is the remedy focused on replacement rather than refund? Power supplies are specialized components designed to match the voltage and current requirements of sensitive electronic sensors. A generic replacement might not work correctly, potentially causing further damage to your PurpleAir PA-II or PA-II-SD sensor. By providing a direct replacement, PurpleAir ensures that your air monitoring equipment continues to operate safely and accurately. Once you contact them using the methods above, they will guide you through their specific logistics. This typically involves instructions on how to dispose of the old, hazardous power adapter—likely requiring safe disposal due to its fire risk—and how to receive the new unit. There may be shipping costs involved, or they may cover them; this detail is not specified in the public recall facts, so it is essential to ask during your contact with them.
It is also worth noting that while the recall addresses the power supply, your PurpleAir air quality sensor itself remains safe to use once the correct adapter is installed. The hazard lies strictly in the overheating of the black power adapters with white labels (model number RKPO-UL052000C). Therefore, you do not need to discard your entire monitoring setup. By following the replacement instructions provided by PurpleAir, you are essentially performing a repair that eliminates the fire and burn hazards associated with the original unit. This approach allows you to continue monitoring your outdoor air quality without interruption, provided you act promptly to swap out the defective component.
What can happen if you ignore it
It is completely understandable why you might hesitate to stop using your air quality sensor. These devices provide valuable data about the health of your local environment, and replacing hardware can feel like an inconvenience, especially when you are accustomed to relying on its readings for daily decisions. However, continuing to use a recalled power supply unit is not merely a matter of wasting money or losing data; it is a direct engagement with a serious physical danger. The core issue here is thermal runaway. Power supplies are designed to convert electricity safely, but in the case of the PurpleAir units involved in this recall, the internal components can overheat beyond their design limits. When an electrical component overheats, it does not just stop working; it begins to break down chemically and physically, often releasing energy in uncontrolled ways.
The consequences of ignoring this hazard have already manifested in real-world scenarios reported by PurpleAir. The company has documented 27 specific incidents where these faulty power supplies emitted sparks or smoke. These are not abstract warnings; they are evidence that the failure mode is active and occurring during normal operation. Most alarmingly, among these reports, there were 18 instances of property damage. This includes at least one confirmed small apartment fire. While no injuries have been reported to date, the presence of fire in a residential setting represents an extreme escalation of risk. A spark can ignite nearby combustible materials—such as curtains, furniture, or structural wood—turning a minor electrical fault into a life-threatening emergency.
Even if a fire does not start immediately, the risk of burns remains high. The power adapters are compact and often placed in enclosed spaces or near surfaces that can trap heat. If the unit continues to overheat while you ignore the recall notice, the exterior casing can become hot enough to cause second-degree burns upon contact. This is particularly dangerous if the device is installed in locations that require physical interaction, such as mounting brackets on walls or outdoor enclosures where maintenance might be needed.
Furthermore, relying on a potentially faulty power source undermines the very purpose of your air quality monitoring. If the internal components are failing due to heat stress, the sensor’s readings may become inaccurate or erratic. You could be making health-related decisions based on bad data while simultaneously risking your home’s safety. The path of least resistance today—doing nothing—can lead to catastrophic outcomes tomorrow. The remedy is simple and free: contact PurpleAir for a replacement. There is no need to gamble with the stability of your power supply when a safe, corrected version is available.
Staying safe: broader tips
While this specific recall addresses a defective component in certain PurpleAir devices, the underlying issue—electrical components overheating—is a common thread in many household fire hazards. Power supplies, often called "brick" adapters or wall warts, are ubiquitous in our modern lives, powering everything from smartphones to air quality monitors. Because they convert high-voltage alternating current from your wall outlet into the low-voltage direct current that sensitive electronics need, they generate heat as a byproduct. This is normal to a degree, but when insulation degrades, vents become blocked, or internal components fail, that heat can escalate into a serious fire risk. Understanding how to manage these devices proactively can significantly reduce the likelihood of such incidents in your home.
First, always prioritize ventilation for any electronic device that plugs directly into an outlet. Many users tuck power adapters behind bulky furniture, inside closed cabinets, or beneath stacks of paper to hide unsightly cords. While this may look tidy, it traps heat. If the adapter cannot dissipate its generated warmth, internal temperatures rise unchecked, accelerating the breakdown of plastic casings and wiring insulation. Keep these devices in open, airy spaces where air can circulate freely around them. Additionally, avoid daisy-chaining power supplies into multiple extension cords or surge protectors that are already near their capacity. Overloaded circuits not only strain the adapter but also increase the resistance in your home’s wiring, creating additional heat sources.
Regular visual and tactile inspections are another simple yet powerful defense. Periodically check your power adapters for signs of wear, such as cracked casings, frayed wires, or discoloration on the plug prongs. If an adapter feels unusually hot to the touch during normal operation, or if you notice a burning smell, unplug it immediately and discontinue use. Do not attempt to repair faulty electronics yourself; this is a job for professionals or manufacturers. Instead, replace them with new, certified units that meet current safety standards.
Beyond individual device maintenance, staying informed about product safety is crucial. The Consumer Product Safety Commission (CPSC) maintains a database of recalls that you can search by brand or product type. Consider subscribing to email alerts from the CPSC or checking their website regularly, especially if you purchase electronics from various retailers. Installing smoke detectors on every level of your home and testing them monthly ensures that you have an early warning system in place. Finally, never leave charging devices unattended for extended periods overnight, particularly if they are older or show signs of age. Taking these general precautions creates a safer environment for all your electronic gadgets, not just those subject to recalls.