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Air pollution can occur naturally or be caused by human activities. [4] Air pollution causes around 7 or 8 million deaths each year. [5] [6] It is a significant risk factor for a number of pollution-related diseases, including heart disease, stroke, chronic obstructive pulmonary disease (COPD), asthma and lung cancer.
In the United States, the National Weather Service issues an Air Stagnation Advisory when these conditions are likely to occur. [6] When substantial accumulations of smoke, dust, industrial emissions, or air pollution are predicted to occur close to the ground for a prolonged amount of time, the National Weather Service issues this product. [6]
In addition to the severe health issues caused by haze from air pollution, dust storm particles, and bush fire smoke, reduction in irradiance is the most dominant impact of these sources of haze and a growing issue for photovoltaic production as the solar industry grows. [6]
CAPE is effectively the positive buoyancy of an air parcel and is an indicator of atmospheric instability, which makes it valuable in predicting severe weather. CIN, convective inhibition , is effectively negative buoyancy, expressed B- ; the opposite of convective available potential energy (CAPE) , which is expressed as B+ or simply B.
An inversion traps air pollution, such as smog, near the ground. An inversion can also suppress convection by acting as a "cap". If this cap is broken for any of several reasons, convection of any humidity can then erupt into violent thunderstorms. Temperature inversion can cause freezing rain in cold climates.
Fog or low clouds limit visibility and can cause travel delays by car and air. About 20% of vehicle crashes are weather-related each year, according to the U.S. Department of Transportation. Most ...
Detroit and Los Angeles, where wind and weather conditions caused the pollution to linger, had among the worst air quality in the country Friday morning following holiday celebrations.
Stagnant air, often caused by an anticyclone, temperature inversion, or low wind speeds lets air pollution remain in a local area, leading to high concentrations of pollutants, chemical reactions between air contaminants and hazy conditions.