SAN FRANCISCO (AP) — The maker of a popular line of hair-straightening products has agreed to alert consumers that two of its formulations emit formaldehyde gas, a possible carcinogen, California's attorney general announced Monday. The labeling changes are designed to settle a lawsuit the state filed in November against the company that makes Brazilian Blowout products, which have been a boon for those who dislike their naturally curly tresses but a source of health concerns. The products are applied during salon treatments and coupled with high heat to temporarily smooth the hair shaft.