See also: Dealing with Breathing Problems written for patients. The term hyperventilation describes excessive ventilation of the lungs, beyond what is required to achieve normal arterial blood gases.
A light frost occurs when the temperature drops to below 32 degrees Fahrenheit, and refers to the conditions that allow a layer of ice crystals to form when water vapor condenses and freezes without first becoming dew. Harvest basil and other tender herbs before a light frost (when the temperature drops to 32 degrees Fahrenheit). 2  Even if they survive the frost, they don't do well in cold temperatures. 3  The same is true for most annuals.
The location of your garden can play a big factor in whether your plants are damaged by a frost or not. Generally, air temperature lowers from 3-5 degrees Fahrenheit with each thousand-foot increase in altitude. Therefore, the higher the elevation of your garden, the more likely your plants will be hit by a frost or freeze. On the other hand, cold air is heavier than warm air and can sink to lower areas, causing frost damage.