It is an indicator of poor air quality from air pollution. This pollution is most often ozone or particulates. Typically it indicates that the air is unhealthy for children, the elderly, and sensitive groups.
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An air quality alert is issued when air pollution levels are high and could pose a health risk, especially to sensitive groups such as children, the elderly, and individuals with respiratory conditions. People are advised to limit outdoor activities and take precautions to reduce exposure to pollutants.
An Air Quality Objective refers to a specific target or goal set by regulatory authorities to protect public health and the environment from the harmful impacts of air pollution. These objectives outline the allowable levels of different pollutants in the air to ensure air quality standards are met and maintained. Meeting these objectives helps to mitigate health risks associated with poor air quality.
A local pollen alert typically indicates higher levels of pollen in the air in a specific area. This information is often provided to help individuals with pollen allergies be better prepared and take necessary precautions to manage their symptoms.
The term "ion" on your fan refers to the ionizer feature. This feature releases negative ions into the air, which can help improve air quality by reducing allergens, pollutants, and odors.
We can preserve the air quality by banning CFC's. They react with ozone and deplete it.
The air quality index (AQI) is a measure used to communicate how polluted the air is in a specific area. It takes into account various pollutants like ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide to provide a single number that indicates the overall air quality. Higher AQI values indicate poorer air quality and a greater risk to human health.