The majority of intervention strategy examples offered are single interventions. However, we know from experience with tobacco control and related cancer risks that it is not just one intervention that can claim responsibility for the reductions we now see in lung cancer death rates. Multiple interventions at multiple scales have been recommended by the Community Guide, such as:  

• Individual-level interventions – smoking cessation programs, including quitlines and mobile phone text messages.
• Policy interventions – smoke-free policies and increasing the unit price for tobacco products. 
• Comprehensive tobacco control programs — a combination of evidence-based strategies at multiple levels to reduce tobacco use and secondhand smoke exposure. 

Multiple interventions at multiple scales are also why we are seeing improvements associated with reductions in carcinogenic air pollution although further reductions are needed across the country. For example:

• Individual-level interventions – increasing awareness of and adherence to air quality alerts.
• Institutional interventions – use of air filtration devices to improve indoor air quality compromised by the penetration of polluted outdoor air; ride share programs; use of substitution as a pollution prevention technique to minimize use of toxic chemicals and mitigate air emissions.
• Policy-level interventions: improved emission standards; use of clean air zones and other zoning changes; converting vehicle fleets to electric engines; increasing public transportation infrastructure.