NOx gases react to form smog and acid rain as well as being central to the formation of fine particles (PM) and ground level ozone, both of which are associated with adverse health effects.. NOx is produced from the reaction of nitrogen and oxygen gases in the air during combustion, especially at high temperatures.In areas of high motor vehicle traffic, such as in large cities, the amount of nitrogen oxides emitted into the atmosphere as air pollution can be significant.Ox gases react to form smog and acid rain as well as being central to the formation of fine particles (PM) and ground level ozone, both of which are associated with adverse health effects.. NOx is produced from the reaction of nitrogen and oxygen gases in the air during combustion, especially at high temperatures.
1 Grey squirrels are mainly herbivorous, eating acorns and hazel nuts, berries, fungi and even bark, buds and shoots. 2  However, on rare occasions when plant food is very scarce they will eat insects, smaller rodents, bird eggs and nestlings. 3  Grey squirrels breed twice a year, December to February and May to June.he hind legs are bigger and more powerful than the front legs. 1  Grey squirrels are mainly herbivorous, eating acorns and hazel nuts, berries, fungi and even bark, buds and shoots. 2  However, on rare occasions when plant food is very scarce they will eat insects, smaller rodents, bird eggs and nestlings.
Humans pose a threat to grey foxes through hunting, trapping, and the use of automobiles. Also, a farmer may resort to killing a fox if it acts as a nuisance to his animals. The four main predators of the grey fox are the coyote, the bobcat, the golden eagle, and the great horned owl.The grey fox will either hide under cover or climb trees to evade danger. Grey foxes will fight for their lives with their teeth and sharp claws if they are unable to escape in time.he grey fox also eats invertebrates such as grasshoppers, beetles, butterflies, and moths. Along with birds, eggs, fruits, nuts, and grains, these invertebrates make up most of a grey foxâs diet in the spring.