sgmoo, the restaurant thing I mentioned was outdoor seating (sidewalk seating in this case) which is subject to automobile and truck and bus exhaust fumes. Those are there even when the smokers are not. How can you differentiate and reject cigarette smoke while the other pollutants are there regardless?
sgmoo, the restaurant thing I mentioned was outdoor seating (sidewalk seating in this case) which is subject to automobile and truck and bus exhaust fumes. Those are there even when the smokers are not. How can you differentiate and reject cigarette smoke while the other pollutants are there regardless?