This Statement on Form 4 is filed
jointly by Perception Capital Partners II LLC, Perception Capital Partners LLC,
Northern Pacific Group, L.P., Scott Honour and Marcy Haymaker.
      The principal business address of each of these reporting persons is 3109
W 50th St., #207, Minneapolis, MN 55410

Name of Designated Filer:
Perception Capital Partners II LLC

Date of Event Requiring Statement:
October 19, 2023

Issuer Name and Ticker or Trading
Symbol:

Spectaire Holdings Inc. (Nasdaq:
SPEC)

PERCEPTION CAPITAL PARTNERS II
LLC

By:    /s/ Scott
Honour

       --------------------------------------

Name:  Scott Honour

Title: Authorized Signatory

PERCEPTION CAPITAL PARTNERS
LLC

By:    /s/ Scott
Honour

       --------------------------------------

Name:  Scott Honour

Title: President

NORTHERN PACIFIC GROUP, L.P.

By:    /s/ Scott
Honour

       --------------------------------------

Name:  Scott Honour

Title: Authorized Signatory

       /s/ Scott Honour

       Scott Honour

       /s/ Marcy Haymaker

       Marcy Haymaker

Honour Scott 4