Nokia and Dell have been given gold stars for their green behaviour by Greenpeace.
Both players were given seven out of 10 for their active eco-friendly stance in the non-profit organisation's Guide to Greener Electronics.
But Apple, Acer, Motorola and Lenovo were lambasted for their poor show. Their combined score only just outpaced Nokia and Dell's individual ratings.
Greenpeace analysed 14 of the leading PC and mobile manufacturers and ranked them on their use of toxic chemicals and levels of e-waste.
HP was ranked third, followed by Sony Ericsson, Samsung, Sony, LG Electronics, Panasonic, Toshiba and Fujitsu Siemens. While these weren't given shining report cards, they still did better than the four companies trailing at the bottom of the scorecard.
Both Nokia and Dell have taken their responsibilities as equipment producers very seriously, according to the eco-body.
Since the end of last year, the mobile phone giant has ensured that all its new models are free from toxic chemicals such as polyvinyl chloride (PVC). From 2007, it has committed to ensuring that all new components will be free from brominated flame retardants (BFRs).
Computer giant Dell has also set itself deadlines from ridding its products of these substances.
Kruszewska added: "The scorecard will provide a dynamic tool to green the electronics sector by setting off a race to the top. By taking back their discarded products, companies will have incentives to eliminate harmful substances used in their products, since this is the only way they can ensure safe reuse and recycling of electronic waste."
Greenpeace now plans to encourage companies to up their ranking by updating the guide on a quarterly basis.
If anyone is found to be misbehaving of providing false information about their practices, the organisation will deduct points and reduce their standing in the ranking.
