L’inquinamento urbano da polveri sottili indotto da un evento estremo:

il Capodanno 2015 a Napoli

Nicola Scafetta Adriano Mazzarella

Osservatorio Meteorologico della Federico IISupersito di San Marcellino

Time behavior of PM10 and PM2.5air concentration

Temperatura potenziale inSant' Elmo and San Marcellino

2854.00

PPT

ME

Sant' Elmo: Tmin = 2.9 oC, P = 986 hPa, E= 5.6 oC

San Marcellino: Tmin = 4.6 oC, P = 1016 hPa, M= 5.1 oC

Po = 1022 hPa

= 0.5 oC: Predicted air pollution severity = low

1.8 km

50 m asl

250 m asl

PM10 and PM2.5 concentration vs.wind speed

PM10 and PM2.5 concentration vs.Hi wind speed

10 km

Average wind stress: 5 m/s = 18 km/h direction 61o (NE)

Time behavior of PM10-2.5 and PM2.5 percent

PM2.5 = 83%PM10-2.5 = 17%

PM2.5 = 71%PM10-2.5 = 29%

PM2.5 = 89%PM10-2.5 = 11%

PM10-2.5 and PM2.5 percentvs. Wind Stress

PM10 and PM2.5 ratio vs.Hi wind speed

Conclusion• Meteorological conditions predicted low pollution.• PM10 and PM2.5 midnight peak was at 250-300 g/m3 from less than 20 g/m3

• (before) 83% of PM10 was PM2.5• (during) 89% of PM10 was PM2.5• (after) 71% of PM10 was PM2.5• Negative correlation with the wind stress (5 m/s)• The 20 km wide metropolitan area was smog-

cleaned by the NE wind in 30 minutes• PM2.5 is cleaned faster than PM10

Wash the city after 'Capodanno'!

AND ....EVERY WEEK.

The Solution?