Bloomberg China called for better coordination to cut emissions after a sixth day of heavy smog engulfed much of the northern part of the country and spurred the year’s highest alert. With the toxic haze shrouding the capital Beijing, coastal Tianjin, and surrounding Hebei province, the environmental protection ministry called for cities to coordinate anti-emission measures such as halting …

  Bloomberg Beijing and other regions of north China were blanketed by the year’s worst bout of noxious smog, prompting officials to cancel 351 flight departures from the capital’s airport because of limited visibility. The concentration of PM2.5 — the particles that pose the greatest health risks — was 402 micrograms per cubic meter near Tiananmen Square at 5 p.m. …

  Bloomberg Southwest Airlines Co.’s website failed, blocking access to booking and flight check-in tools in a busy holiday travel week. The carrier said it was making progress in fixing the disruption and was getting reports of successful transactions and online check-in attempts around 5:45 p.m. New York time. The failure affected all customers but didn’t have any impact on …