A industry survey by IBISWorld placed annual revenue from food trucks around $1.2 billion in 2009 and annual growth rates from 2007-2012 near 8.4% annually. Street Vendors in the US: Market Research Report estimated that there are over 15,500 individuals who serve food to diners in open-air locations.
Ozone depletion would magnify all of the effects of UV on human health, both positive (including production of Vitamin D) and negative (including sunburn, skin cancer, and cataracts). In addition, increased surface UV leads to increased tropospheric ozone, which is a health risk to humans.s explained above, the primary cause of ozone depletion is the presence of chlorine-containing source gases (primarily CFCs and related halocarbons). In the presence of UV light, these gases dissociate, releasing chlorine atoms, which then go on to catalyze ozone destruction.
Ozone-depleting substances. Gases that damage the ozone layer-ozone-depleting substances (ODS) - have been used in a wide range of industrial and consumer applications, mainly in refrigerators, air conditioners and fire extinguishers.They have also been used as aerosol propellants, solvents and blowing agents for insulation foams.o protect the ozone layer the international community established the Montreal Protocol on substances that deplete the ozone layer in 1987. The European Union and its Member States are at the forefront of ozone layer protection with a policy that often goes beyond the requirements of the Montreal Protocol.