HELP PLEASE Which of these chemicals is not a pollutant?
A. Methane
B. Nitrogen gas
C. Nitrate
D. Carbon dioxide

All these chemicals are primary causes of pollution. Although, only one isn't an air pollutant. Which would make my best Guess C. Nitrate

Explanation:

A. Methane Is the main component in gas and oil. Oil companies have been responsible for polluting our air with about seven million tons of methane per year.

B. Nitrogen gas in general is one of the main air pollutions. otherwise know as Nitrogen dioxide.

C. Nitrates are found in ground waters and transfers into the soils surrounding said waters. Nitrates commonly are a cause of death in infants when drinking tab water or eating crops grown from nitrate infected soils. Adults aren't nearly as infected by this.

D. Carbon Dioxide is a greenhouse gas that pollutes our air and has been a main cause of global warming.

I'm at a loss for answering this question since all of these are polluting our earth in some way. The only way I can think to answer this is that all but one are air pollutants. So maybe the one that is not a air pollutant is the correct answer. My best guess is C. Nitrate

Hopes This Helps :)

The correct answers are option A, It must be 1,000 miles or more in size.option C, It flows as one unit and option E, It has a uniform temperature and humidity.

An air mass is an extremely large patch of air which flows as a single entity. The temperature and humidity conditions within an air mass are same. The physical characteristics of air mass are acquired from the region of its source. However, a flowing air mass imparts its properties to the region where is stays or sits over for several days. These are pushed by high level winds. The prevalent size of an air mass is 1600 km (1000 miles) or more.