Environmental Fly Control. Making the environment as unappealing as possible is the first line of defense when it comes to keeping flies away from your dog. Flies are most active during daylight hours and especially in high heat, so keep Fido inside the house during the hottest times of the day.
Does polystyrene deplete the ozone layer? 1  Initially a portion of polystyrene production was aided by the use of chlorofluorocarbons (CFCs), the chemicals that break down ozone in the troposphere. 2  Though polystyrene manufacturers claim that their products are ozone-friendly or free of CFCs, this is only partially true. The use of hydrocarbons in polystyrene foam manufacture releases the hydrocarbons into the air at ground level; there, combined with nitrogen oxides in the presence of sunlight, they form tropospheric ozone -- a serious air pollutant at ground level.
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