The most obvious form of pollutionassociated with plastic packaging is wasted plastic sent to landfills. Plastics are very stable and therefore stay in the environment a long time after they are discarded, especially if they are shielded from direct sunlight by being buried in landfills.
Links
[1] https://hootsgo.org/?q=node/6693
[2] http://www.environmentalhealthnews.org/ehs/news/dangers-of-plastic