Figure: Greenhouse gas emissi-l:o6z.ea1 xl tdpdr,0j:l vvons by sector



Scientists analyzed the main contributors to greenhouse gas emissions from human-related activities. The resulting data is presented in the Figure.

Identify the contributor that is most responsible for the production and release of methane and nitrogen oxides into the atmosphere.

  Identify the chemical that is a major ce 9boi jdm9f/*ontributor to photochemical smog.

  Particulates are produced during the combustion of fossil fuels and emig :)k q4.jh lfeimwx20+;m hdttted into the atmosphere. PM2.5 refers to the diameter of the particulatm 0k mhg+w2;eh)ql4 dji. xt:fe matter.
State which unit of measurement is referred to by PM2.5.

  Figure: An urban environm*p(0w +3pd9*pf0c bmcpl bn scent


Deduce the name of the process explained in the Figure.

  Identify which of the i,gg wincm)7v h t24;cfollowing factors contribute to the frequency and severity7i ) v,g;i2c t4mhgwnc of smog.
I.
Local topography (the shape of the land)
II.
Climate
III.
Population density
IV.
The amount of fossil fuels used

  Nutrients are constantlyltd, ,ogtn*4i cycled in ecosystems, including in the atmosphere as a gaseou, tglnot 4*di,s form.

State which element is not found in the atmosphere.

  Determine which of the following greenhouse gases is correctly ho;+y+cg eg4ai/77tx/ pin1l fac(a q paired with its sh onie7+ccaa 7q+lg(f1gi /a;pt x/y 4ource.

  Figure: Causes and effects ob +bq)3hh8rv af air pollution

State, according to the Figure, which of the following is the largest contributor to air pollution:

  Deduce which of the followinwuqcen:zbc ,-c*nnh:h1qix*/p 5puw8z,-tu g would not be considered a pollution management strategy to regulate and reduce the pollutants causing smog and overallqhc,*unnzuq*-x,zbwc:c ppt/ -51h :8e uiw n air pollution at the point of emission.

  List the main greenhobz y y5whe4 :g5nj90ygmp -*gxuse gases.

  State what photochemic 3por;fr3dqk (c2nmm9al smog is a mixture of.

  Identify the statement(s) that are not true about primary poll -(9/x4b qbqhmw2omh xutants.
I.
Released directly from a source into the environment
II.
Usually more toxic than secondary pollutants
III.
Formed when pollutants combine under certain environmental conditions

  Predict the combination of factors tha b7ovoixyw2wfu-33n 88nes w)nn 9ah;t would most likely lead to the formation of photochemical smog;wf ox-nn9yens3hwi)8b 2n8u7aov w 3.

  Figure: Standards for PM10 ay c,4)z wlv byz7b4;rgir pollutants
WHO /$\mu$gm EU /$\mu$gm USA $\mu$gm
-3 -3 -3
24hours 24hours 24hours
−1 −1 −1
45 50 50

Calculate the percentage difference between the WHO guideline standards and the USA standards.

  Figure: Causes and effects of air polluge s.sf z6 )fo8iuc2*m6sp)crtion

Identify the two chemicals shown in the Figure that are also significant causes of the greenhouse effect and climate change.