what's wrong with nitrogen and sulfur?

 I see when they're mixed with O2 and become oxides they're more dangerous, but these little machines can't produce anywhere near what one cow produces. Why would CA ban them?

Health effects

NO_x react with ammonia, moisture, and other compounds to form nitric acid vapor and related particles. Small particles can penetrate deeply into sensitive lung tissue and damage it, causing premature death in extreme cases. Inhalation of such particles may cause or worsen respiratory diseases such as emphysema, bronchitis it may also aggravate existing heart disease.^[5]

NO_x react with volatile organic compounds in the presence of heat and sunlight to form Ozone. Ozone can cause adverse effects such as damage to lung tissue and reduction in lung function mostly in susceptible populations (children, elderly, asthmatics). Ozone can be transported by wind currents and cause health impacts far from the original sources. The American Lung Association estimates that nearly 50 percent of United States inhabitants live in counties that are not in ozone compliance.^[6]

NO_x (especially N₂O) destroys ozone layer.^[7] This layer absorbs ultraviolet light, which is potentially damaging to life on earth. ^[8]

NO_x also readily react with common organic chemicals, and even ozone, to form a wide variety of toxic products: nitroarenes, nitrosamines and also the nitrate radical some of which may cause biological mutations.