"The "Antelope Valley Residents for Responsible Development," a group backed by the International Brotherhood Workers Union Local 11, produced a 588-page appeal claiming that construction of the proposed factory would violate state environmental laws, by, among other things, kicking up spores. What the union really wanted, according to Kinkisharyo officials, was clearance to organize the plant without any interference from the company. When Kinkisharyo officials balked, the project suddenly became a potential environmental hazard." OP's link
"Valley Fever (Coccidioidomycosis) is primarily a disease of the lungs that is common in the southwestern United States and northwestern Mexico. It is caused by the fungus Coccidioides sp., which grows in soils in areas of low rainfall, high summer temperatures, and moderate winter temperatures. These fungal spores become airborne when the soil is disturbed by winds, construction, farming and other activities.
Valley Fever infections are more likely to occur during certain seasons. In Arizona, the highest prevalence of infections occurs June through July and from October through November. In California, the risk of infection is highest from June through November, without the late summer break.
It is estimated that there are about 150,000 infections in the southwestern U.S. each year. Approximately one-third of these results in a self-limited, possibly lengthy, respiratory illness. However, in a small percentage the illness is more serious and potentially lethal.
In susceptible people and animals, infection occurs when a spore is inhaled. Within the lung, the spore changes into a larger, multicellular structure called a spherule. The spherule grows and bursts, releasing endospores which develop into spherules. Valley Fever symptoms generally occur within three weeks of exposure. Valley Fever is not a "contagious" disease, meaning it is not passed from person to person. Second infections are rare..."
https://www.vfce.arizona.edu/GeneralInfo/WhatIsValleyFever.aspx