Making general statements is superficial and empty. I live in a cold climate where wood and coal powered stoves are responsible for more than 90%+ of particulate pollution. The difference between warm and cold months is quite significant: around 20 µg/m³ daily average in the middle of summer vs 300-400 µg/m³ in the middle of winter. Maximum values are somewhere around 1000-1500 µg/m³, with short-term spikes up to more than 3000+ µg/m³ due to temperature inversions.