Your profile shows you are an air hostess. I thought you would have known more than most what is and what isn't 'fresh air', because you are breathing recycled unfresh bacteria laden air in your job, and I would have thought you would have researched the hazards this poses to your health.
Whether there are, or are not, persons smoking tobacco near you in a beer garden you are not breathing 'fresh air' - there are multiple pollutants present which you cannot necessarily see or smell and which are a greater threat to your health. Burning leaves are a lesser hazard than vehicle emissions, so it depends whether your chosen beer garden is adjacent to a public highway or up a swiss alp. If you want truly fresh air I suggest Antarctica
