Title: Crime drop - Wikipedia
Headings: Crime drop
Crime drop
Contents
Historical context
Decline since the Middle Ages in Western Europe
Increase between the late 1950s and early 1990s
Global level
Homicide rates as comparative value
Decline since the early 1990s
Development by region
Germany
United States
Proposed explanations
Lead
Air pollution
Abortion
Drug use and demand
Economic factors
Immigration
Incarceration
Policing
Security hypothesis
See also
References
Further reading
External links

Content: Since youth tend to commit the majority of violent crimes, and since older members of societies tend to be the more orderly and peaceful, as populations grow older their violence rates tend to decline. However, the most violent countries are not yet enjoying the pacifying benefits of the aging of their populations because other strong criminogenic forces are interfering with their homicide trends. Lead
The lead–crime hypothesis proposed a link between elevated blood lead levels in children and later increases in crime. Children exposed to forms of lead at young ages are hypothesized to be more likely to develop learning disabilities, attention deficit hyperactivity disorder, and problems with impulse control. These problems are suggested to lead to the commission of more crimes as these children reach adulthood, especially violent crimes. Air pollution
Air pollution has been found to highly correlate with increased aggression and higher crime rates with one study detailing that a 10% reduction in PM 2.5 and ozone could