(17 October 19) The new deal achieved by EU and UK negotiators brings significant changes to the earlier deal agreed under the Prime Minister May: it allows the UK to diverge from EU environmental and health protection standards.

The Withdrawal Agreement no longer contains
 an environmental non-regression clause for the UK and keeps only 
Northern Ireland aligned with many EU standards in order to maintain an 
open border in Ireland.
The Political Declaration still includes text
 on a level playing field, but the details remain to be worked out 
during trade negotiations. The Declaration says that both parties pledge
 to uphold “the common high standards applicable in the Union and the 
United Kingdom at the end of the transition period” and then maintain 
high environment standards “at the current high levels provided by the 
existing common standards”. A reference to the Paris Climate Agreement 
has been inserted as well. The text continues to mention the possibility
 of co-operation with EU chemicals agency ECHA, however the text 
following this in the original political declaration, a commitment “to 
consider aligning with Union rules in relevant areas” has been deleted.
The  chemical industry has cautiously welcomed the deal, noting there is  still possibility of co-operation between the UK authorities and Union’s  agencies such as the European Chemicals Agency.
Revised Political Declaration and Protocol on Ireland and Northern Ireland
CEFIC’s reaction