One reason would be serious case of sun burn and another would be eventual case of skin cancer.
If temperatures are over 90 degrees F., food shouldnot be left out for over an hour, and never in direct sunlight. If the temperatures are lower, or in an air conditioned area, two hours is the limit. After the limit, food should be thrown out or refrigerated.
10pm to 4pm
It usually occurs when you do not take enough fluids in extreme heat, ranging from about 30+ degrees Celsius, usually in direct sunlight, to prevent this; limit the time you spend in the direct sunlight and also keep your body hydrated (Drink plenty of water)
In the US, the occupational exposure limit for airborne asbestos is 0.2 fibers per cubic centimeter of air.
Permissible Exposure Limit
The permissible exposure level of lead is 50ug/m3.
There are multiple acronyms for STEL. The primary acronyms for STEL are: Short Term Exposure Level, Short Time Exposure Limit, Short Term Exposure Limit, Solar Terrestrial Environment Laboratory, and Stand for Threshold Limit.
You may have greater sensitivity to light and should limit your exposure. You'll burn more easily.
No. Unless it is DIRECT SUNLIGHT (if it can give you a sunburn, it will damage your screen). However, if it is behind filtered light, such as a window, then there is no real threat of damage. Owners manuals for plasma TVs will say not to put them in areas where the sun will shine on them, even through glass, but it is merely to limit their liability for warranty; if there is an issue, they might say that it was a result of it being in direct sunlight, when in fact it is not (those villains). I worked for Panasonic, so I know all the legal planning that goes into those guides.
You can limit the amount of direct sunlight the canopy recives daily.You could also look into protectant products such as armorall,depending on the type of material the canopy is made of.
The Permissible Exposure Limit (PEL) for hydrogen chloride (the gaseous form of hydrochloric acid) is 5 ppm, or 7 mg/m3, as a ceiling limit. This limit applies to airborne vapor concentrations, not to skin contact with a liquid form of this material.
Between 10 AM and 3 PM the sun is at its highest and therefore strongest.