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.
The gray squirrels diet consists of nuts, seeds and fruit. It will eat bird eggs, bugs, and even an animal carcass if there is no other food source available.The gray squirrel requires some salt in its diet, and may find this salt in the soil along roads where snow and ice may have been.he gray squirrel has a varied diet with mast crops (acorns, walnuts, beechnuts, etc.) being a very important component. Other food items include seeds, fruits, insects, fungi, and occasional bird eggs and bird nestlings.