Well, I'm considered BLS here in Canada. But, here are a few of the interventions I'm allowed by protocol and training:
Chest Pain: IV, O2, ASA, Nitro, ECG.
Aaphylaxis: O2, IV, Epi (after OLMC), Bronchiodilators.
Breathing Problems: Auscultation of lung sounds, Bronchiodilators, O2...