Morphological and Chemical Properties of Particulate Matter in the Dammam Metropolitan Region: Dhahran, Khobar, and Dammam, Saudi Arabia

Table 2

Weather conditions on selected days during Oct. and Nov. 2015 (King Abdulaziz Air Base Station) (source: https://www.wunderground.com/).

Date; 2015	DOY	Wind speed; (km/h)	Wind; direction	Visibility; (km)	Conditions	Mean temp; °C
Oct. 1	274	13	W	10.0	Clear	34
Oct. 2	275	8	W	8.8	Clear	27
Oct. 5	278	13	NW	8.0	Widespread dust	34
Oct. 9	282	10	SW	10.0	Clear	34
Oct. 20	293	7		7.4	Widespread dust	30
Oct. 22	295	7	NW	6.0	Haze-widespread dust; Mist-cloudy	29
Nov. 4	308	12	NW	10.0	Clear	24
Nov. 12	316	17	N	10.0	Scattered clouds-partly clouds	24
Nov. 18	322	10	SW	10.0	Cloudy	24