Urban air pollution What can you remember? 1.List the major sources of urban air pollution. 2.What is a secondary pollutant? 3.Why is photochemical smog greater in the afternoons than the mornings? 4.Outline the effects on humans and other species.

Learning outcomes All of you should be able to: Identify the problems of urban air pollution affecting Mexico City Describe pollution management strategies for urban air pollution Most of you might be able to: Evaluate the management strategies

Formation of particulates Burning organic materials or fossil fuels release small particles of carbon or other substances. We call them: particulates particulate matter (PM 10 ) (PM 2.5 ) These particulates are not filtered by our nose and lungs so can cause problems in our respiratory system.

Case Study – Mexico City Article: 1.What are the consequences of air pollution in Mexico City? 2.What are the key air pollutants in Mexico City? 3.What are the two most serious? 4.Describe what you can see in the graph. 5.What are the main programmes to combat air pollution?

Let’s take a look at the governments’ recommendations…

Pollution Management You have been put in charge of managing a city’s urban air pollution. – In groups come up with some pollution management strategies for urban air pollution. – Evaluate the different methods in order to explain to your shareholders the advantages and disadvantages of each one. – Be ready to present them to the class.

Let’s set up an experiment to see the effect of tropospheric ozone…

Checking outcomes Where does tropospheric ozone come from? What are the effects that it can have? How is photochemical smog formed? Why is it greater in the afternoon than the morning? Pollution management strategies…