If the ONLY pollutants found in the atmosphere over a city are oxides of nitrogen, suspended lead compounds. carbon monoxide and high levels of methane, the probable source(s) of the pollution must be?
automobile exhaust and biological decomposition
combustion of coal and automobile exhaust
biological decomposition only
combustion of coal, automobile exhaust and biological decomposition
combustion of coal and biological decomposition
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error everywhere
D is very crt...
the high level of methane comes from biological decomposition
effect changes..thanks
This is a multiple-choice question that tests your knowledge of the sources of air pollutants. The correct answer is **A. automobile exhaust and biological decomposition**.
The reasoning is as follows:
- Oxides of nitrogen (NOx) are mainly produced by high-temperature combustion of fossil fuels, such as in automobiles and power plants¹². They can also be formed naturally by lightning and volcanoes.
- Suspended lead compounds are mostly emitted by vehicles that use leaded gasoline, which is still used in some developing countries⁵. Lead can also come from industrial sources, such as smelters and battery manufacturing.
- Carbon monoxide (CO) is a product of incomplete combustion of carbon-containing fuels, such as gasoline, coal, wood, and biomass. It can also be emitted by natural sources, such as wildfires and volcanoes.
- Methane (CH4) is a greenhouse gas that is mainly produced by biological decomposition of organic matter, such as in landfills, wetlands, rice paddies, and animal digestion. It can also be released from fossil fuel extraction and distribution, such as natural gas pipelines and coal mines.
Therefore, the combination of these pollutants indicates that the most likely sources are automobile exhaust and biological decomposition. The other options can be eliminated because:
- Combustion of coal would also produce sulphur dioxide (SO2), which is not one of the given pollutants.
- Biological decomposition alone would not produce enough NOx and lead compounds to cause significant pollution.
- Combustion of coal, automobile exhaust, and biological decomposition would produce more pollutants than the ones given, such as SO2, particulate matter, and non-methane volatile organic compounds (NMVOCs).
- Combustion of coal and biological decomposition would also produce SO2 and NMVOCs, which are not one of the given pollutants.
I hope this explanation helps you understand the sources and effects of air pollutants. If you have any more questions, feel free to ask me. 
The correct option to this question is A because if you look at the question the liberation of those polutants oxides of carbon and nitrogen and Suspended lead comes from the exhaust of an automobile while methane comes from Biological decomposition.
A is good 
Combustion of coal is what gives sulphur
We get methane from biological decomposition
suspended lead particles wont jst come from combustion. it shud be from opt A
