The National Standards of People's Republic of China - Inmetro
Appendix C (Appendix of Standards) Test of Emissions on a Cold Start in Normal
.... This means vehicles of categories M1, M2 and N1 with maximum total mass
not exceeding 3500kg. ...... CO and CO2 analyser: non-dispersive infrared
detection (NDIR). ...... The pressure reduction before & after LFE net (EDP) ±
0.0015 kPa.