Plein Air is a fancy French term for painting in the open air. It's a current hotbed for artists, with many "paint outs" sponsored by big and small organizations, There are national level conferences in Las Vegas, and even a slick magazine called Plein Air with some great art in the inaugural issue.
A painting done plein air is a great challenge for the painter, The light changes very fast, the weather can be bad or near impossible, For me wind blows sand and that sticks in the paint, but in spite of all the hard conditions, nothing is so exciting to try, many of the paintings fail, even for the best oof artists. Most of mine go into a folder for reference to color and light. Some come out with a special flavor of the place that no camera or memory can hold like this small 6x8 oil of Portuguese Point with the wind and time coming in.