Figure: Greenhouse gas emissions by sw,zcxb(n4 w. aector



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 contributor to photochq+ 0 7fagqld(yemical smog.

  Particulates are produced during the combustion of fossil fuev 8 u6yvs6ts c3;pyg skx(d3g-ls and emitted into the atmosphere. PM2.5 refers to the dit8pky6g( gsuy6 3vd -vss3c;xameter of the particulate matter.
State which unit of measurement is referred to by PM2.5.

  Figure: An urban environmenf8n3valfix v(:tg,t9af6 cr8t


Deduce the name of the process explained in the Figure.

  Identify which of the following facrpid)murl71bc e99 c8tors contribute to the frequency and severity of scm19ec) rr8i p 7du9blmog.
I.
Local topography (the shape of the land)
II.
Climate
III.
Population density
IV.
The amount of fossil fuels used

  Nutrients are constantly cycled in ecosystems, incl6)j**tr bvertiov7n hwo;98 zwm p/c+uding in the atmosphere as a gaseouspjzo*b w v* mn8w7tchrtv69 )o /+;ire form.

State which element is not found in the atmosphere.

  Determine which of the following greenhouse gasesw e 8t9(7umqth is correctly paired with its sot ew9 q8h7tm(uurce.

  Figure: Causes and effects of air )e(conu4x uu;nb93 qv4mczw8pollution

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

  Deduce which of the following would not be dphy:cq n7 ho:sq41, zconsidered a pollution management strategy to s1zqd4hc:pn7 ,hyqo:regulate and reduce the pollutants causing smog and overall air pollution at the point of emission.

  List the main greenhouse gaoj;mka8b* /gcq)bz e -ses.

  State what photochemical smog is a mixture onwqf kez77 v cq+4kkyosk9+4+f.

  Identify the statement(s) that are n;wo tzvskbu,nl nwpk 1z e--w 779po4/ot true about primary pollutants.
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 that would most likely lead to the fc6tcle.- hp6tormation of pho-p.cl6te h6c ttochemical smog.

  Figure: Standards for Px8op jmkycyuki )/7v 2 oq3 pm*9l/k2hM10 air 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 ez(q/so -ilgly (rwr21 ffects of air pollution

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