“It also assumes that NOx emissions from cars will stay roughly the same, because although fewer people are going to the office, many are using cars when previo

“It also assumes that NOx emissions from cars will stay roughly the same, because although fewer people are going to the office, many are using cars when previously they would have taken buses or trains.” We should be past the point of assumption at this point. According to a chart on this page from this credible source, auto trip counts are down by about 20%... https://inrix.com/covid-19-transportation-trends/ https://inrix.com/covid-19-transportation-trends/