That's a more interesting question than it might seem at first! While it varies by region and purpose, a few colors dominate urban landscapes globally.
The most universally common color is likely dark green. It's practical – it hides dirt and stains better than lighter shades – and it has a traditional, "public works" association in many countries. Gray (especially slate or concrete gray) is another top contender, particularly for modern or minimalist urban designs where bins blend into sidewalks and streetscapes.
However, the real story is in color-coding for waste separation. This system is becoming the new standard in many cities:
* Blue is almost universally adopted for paper and cardboard recycling.
* Green (often a brighter shade than standard bins) is frequently used for glass or organic waste.
* Yellow is widely recognized for plastic and metal packaging.
* Black or gray is typically reserved for general, non-recyclable waste.
Beyond pure function, some cities use color strategically. You might see vibrant orange or red bins in commercial districts for high visibility, or more subdued, earth-toned bins in historical areas to preserve aesthetic harmony. The choice often balances visibility for users, cost-effectiveness for municipalities, and integration into the local visual environment.
So, while classic green and gray are the workhorses, the trend is toward a more colorful, systematic approach that guides public behavior and improves recycling rates. The most popular color, therefore, is increasingly the one that clearly communicates its purpose.