I bought this mask for smoke in the middle of January 2020 during the height of the bush fires in Australia. At the time I thought $29.95 was a bit much to pay for a filter mask, but the quality seemed reasonably good so I went for it. It turned out to be a fair product and I offered it to a friend who was traveling to highly polluted Delhi. I got good reports back and decided to purchase this product again for my own trip to Delhi. But my god! the price is now $56.99!!! Looks to me like sheer price gouging to take advantage of the corona virus outbreak. Shame on you Amazer Tec!