Winter weather is very cold, and on winter mornings, the sky often appears gray, but in fact, it is covered by a layer of smog. It is estimated that many people still do not know what smog is. Its main components are a mixture formed by nitrogen oxides and inhalable particulate matter. The first two are gaseous pollutants. They combine with fog, causing the sky to change color instantly. In fact, fog is a non-toxic and harmless natural phenomenon, mainly resulting from a large amount of suspended particles in the air and meteorological conditions. The appearance of fog is often accompanied by haze, and conditions such as water vapor, calm winds, temperature inversion, and condensation nuclei are essential.

The toxins in smog not only seriously harm people's health but also have a significant impact on Outdoor LED Display operation. In fact, we can distinguish between fog and haze because their main hazards to Outdoor LED Display are different:
First: The harm of fog to Outdoor LED Display in winter
Fog is formed by the condensation of water vapor in the air during winter. In other words, the relative humidity in the air is relatively high, which will cause the outdoor LED display to become damp. Excessive humidity will cause the PCB board, power supply, power cables, and other components of the display to be easily oxidized and corroded, even causing short circuits and failures.
Second: The harm of smog to Outdoor LED Display in winter
Haze is a collection of dust and various fine particles suspended in the air. The dust suspended in the air is the core material of smog. If exposed to smog for a long time, various fine dust particles in the air will enter the equipment through ventilation holes, accelerating wear and even damaging fans and other equipment. Dust will also settle on the surface of control devices inside the display, which not only reduces the quality of the display but also accelerates the aging of the screen by affecting heat dissipation and insulation performance, thereby impacting the normal service life.
Therefore, Outdoor LED Display how to withstand long periods of smoggy weather requires users and engineers to pay more attention to purchasing and maintenance:
1. First, during the purchasing process, users must check whether Outdoor LED Display meets the dustproof level required for the usage environment. The international standard for dustproofing is IP0X-IP6X, which is the design level to prevent foreign object intrusion. If installed in northern areas with more sand, dust, and smog, the front and back protection levels must reach IP65. In other words, a completely dustproof structure must be used, which must be airtight when sprayed with water.
2. Be sure to check whether Outdoor LED Display PCB boards have undergone anti-corrosion treatment, such as coating with three-proof paint on the surface; whether the power supply and power cables are high-quality accessories; and check the soldering points on the screen that are most prone to corrosion to see if they have been treated for rust prevention.
3. In daily maintenance, we must regularly remove dust to avoid damp weather, as dust absorbs moisture from the air, causing short circuits and mold on PCB boards and electronic components.