Organic food is food produced by methods that comply with the standards of organic farming. Contaminants may include organic and inorganic substances. Cannabis smoke contains thousands of organic and inorganic chemical compounds. Sludge also contains more than trace amounts of organic and inorganic chemicals. PCMs can be either organic or inorganic materials. Humus is different from decomposing soil organic matter. Many published test methods are available for both organic and inorganic compounds. Weekend markets are popular for organic and artisanal foods purchases. Resins are usually mixtures of organic compounds. Nitrogen is one of the most important elements in organic chemistry. Their reaction with organic compounds depends on conditions. Organosulfur compounds are responsible for some of the unpleasant odors of decaying organic matter. Chloroperoxidases are enzymes that catalyzes the chlorination of organic compounds. They thrive in moist soils with high organic matter. Some are manufactured by esterification of organic compounds.