ANNEX IV Requirements with regard to emission control strategies, NOx control measures and particulate control measures

2. Technical requirements relating to emission control strategies

2.4. Control conditions
2.4.3. Control conditions for engines of categories NRE, NRG and RLR:
(a) the atmospheric pressure greater than or equal to 82,5 kPa;
(b) the ambient temperature within the following range:
equal to or above 266 K (– 7 °C),
less than or equal to the temperature determined by the following equation at the specified atmospheric pressure: Tc = – 0,4514 × (101,3 – Pb) + 311, where: Tc is the calculated ambient air temperature, K and Pb is the atmospheric pressure, kPa;
(c) the engine coolant temperature above 343 K (70 °C).