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Transcripts for KNTV NBC Nightly News With Lester Holt 20240604 23:11:00

reporter: arizona is not the only state setting new highs. more than two dozen extreme heat records were either set or tied yesterday. tonight 63 million americans are living under blistering heat threats from southern california to miami. parts of texas hitting 33 consecutive days of triple-digits. austin ems overwhelmed with calls for help. the majority of our patients that are coming in for heat-related issues are younger males between like 18 and 50. reporter: and it s not just soaring temperatures. thick smoke sweeping the east coast. tonight nearly 70 million americans under air quality alerts, fuelled by the canadian wildfires, now burning for weeks. the climate crisis experts say makes this dangerous heatwave three to five times more likely. back in phoenix, even the cactuses, symbols of desert survival, are suffering. so this plant is probably 40 to 50 years old. and this is clearly a plant that is under ....

U S , State Setting , Heat Threats , Southern California , 63 Million , Triple Digits , Climate Crisis Experts , Air Quality , East Coast , 70 Million , Desert Survival ,