Search results
Results From The WOW.Com Content Network
Ambient air quality criteria, or standards, are concentrations of pollutants in the air, and typically refer to outdoor air.The criteria are specified for a variety of reasons including for the protection of human health, buildings, crops, vegetation, ecosystems, as well as for planning and other purposes.
An air quality index (AQI) is an indicator developed by government agencies to communicate how polluted the air is or how polluted it is forecast to become. The AQI varies by pollutant, location, and health effects, and is used to advise people on how to reduce exposure and improve air quality.
PDF/A is a version of PDF that is suitable for long-term preservation of electronic documents. It prohibits features such as font linking, encryption, and external references, and requires embedding fonts, color information, and metadata.
The World Health Organization (WHO) recommends that PM2.5 should not exceed 5 μg/m3 annual mean, or 15 μg/m3 24-hour mean; and that PM10 should not exceed 15 μg/m3 annual mean, or 45 μg/m3 24-hour mean. These guidelines are based on the latest scientific evidence and aim to reduce the health effects of air pollution.
The Clean Air Act is the U.S. federal law to reduce and control air pollution nationwide. It targets various pollutants, such as sulfur dioxide, nitrogen oxides, lead, and hazardous air pollutants, from different sources, such as power plants, vehicles, and industries.
Air pollution is the contamination of air by harmful substances that affect human health and the environment. Learn about the different types of air pollutants, their sources (both natural and human-made), and their impacts on health, climate and ecosystems.
The air quality in Malaysia is reported as the API (Air Pollutant Index) or in Malay as IPU (Indeks Pencemaran Udara). Four of the index's pollutant components (i.e., carbon monoxide, ozone, nitrogen dioxide and sulfur dioxide) are reported in ppmv but PM 2.5 particulate matter is reported in μg/m 3.
Portable room air cleaners with HEPA filters can be used if ventilation is poor or outside air has high level of PM 2.5. [112] Air filters are used to reduce the amount of dust that reaches the wet coils. [citation needed] Dust can serve as food to grow molds on the wet coils and ducts and can reduce the efficiency of the coils. [citation needed]