What are important interventions and programs for environmental health?

What are important interventions and programs for environmental health in Saudi Arabia? How are public health interventions planned and evaluated for environmental health? From Arab News (2014), Riyadh was ranked one of the most polluted cities globally according to the UN. How can air pollution in Riyadh be resolved by public health intervention? 
please include in text citation and use the references below  
MOH. (2016). Environmental and occupational health general department. Retrieved from: https://www.moh.gov.sa/endepts/EnvironmentalHealth/Pages/default.aspx
Milaat, W. A. (2014). Public health in the saudi health system: A search for new guardian. Saudi Journal of Medicine and Medical Sciences, 2(2), 77.
Kingdom of Saudi Arabia vision 2030 (2016). Saudi vision 2030. Retrieved from: 
Skolnik, R. (2015). Global health 101. (3rd ed.). Burlington, USA: Jones & Bartlett drafters
The Isosceles Group. (2014). Saudi Arabia environment, health & safety profile and checklist. Retrieved from: https://nimonik.com/case_studies/audit_previews/ksa_audit_preview_health_safety_environment.pdf
Arab News (2014). Riyadh ranked among most polluted cities globally. Retrieved from: http://www.arabnews.com/news/538861