STATE/UT |
CITY |
STATION |
Type of Area |
Average
(µg/m3) |
Std Dev. |
No. of days (n) |
Andhra Pradesh |
Guntur |
Hindu College Guntur |
R |
216 |
23 |
48 |
Hydrabad |
C.I.T.D. Balanagar |
I |
293 |
61 |
109 |
Nacharam |
I |
134 |
56 |
93 |
Uppal |
I |
289 |
62 |
108 |
ABIDS Circle |
R |
190 |
60 |
95 |
Charminar |
R |
311 |
36 |
107 |
Jubilee Hills |
R |
154 |
42 |
108 |
Paradise |
R |
308 |
40 |
108 |
Tarnaka |
R |
181 |
59 |
96 |
Zoo Park |
S |
165 |
37 |
108 |
Kakinada |
OB Ramanyapeta |
R |
122 |
6 |
16 |
Kurnool |
Mourya Inn |
R |
191 |
32 |
99 |
Nalgonda |
RO APPCB |
R |
217 |
36 |
42 |
Nellore |
Venkatreddy Nagar |
R |
193 |
- |
1 |
Patencheru |
Police Station |
R |
208 |
62 |
107 |
Ramagundam |
RTC Bus Depot |
R |
285 |
129 |
84 |
Tirupati |
Reg.Science Center |
S |
127 |
12 |
96 |
Vijaywada |
Autonagar |
I |
219 |
53 |
114 |
Benz Circle |
R |
184 |
26 |
114 |
Visakhapatnam |
CWMP, RAMKY |
I |
137 |
40 |
27 |
Industrial Estate |
I |
183 |
56 |
105 |
Pedagantyada V |
I |
154 |
39 |
27 |
Ganapuram Area |
R |
289 |
90 |
107 |
Panchayat Raj Office |
R |
176 |
52 |
102 |
Police Barracks |
R |
242 |
82 |
106 |
Seethammadhara |
R |
202 |
60 |
107 |
INS-VIRBAHU |
S |
143 |
43 |
108 |
Warangal |
KUDA Office |
R |
150 |
46 |
28 |
Assam |
Bongaigaon |
Barpara Office Bldg |
R |
140 |
118 |
110 |
Campus of Oil India |
R |
153 |
107 |
109 |
Daranga |
BATAD |
R |
148 |
106 |
92 |
Dibrugarh |
Dibrugarh Off. Bldg |
R |
75 |
34 |
103 |
Golaghat |
Golaghat Off. Bldg. |
R |
109 |
86 |
104 |
Guwahati |
Gopinath Nagar |
R |
196 |
156 |
234 |
Head Office |
R |
257 |
199 |
244 |
Santipur |
R |
200 |
173 |
241 |
Hailakandi |
CISF Campus |
R |
150 |
94 |
37 |
Mergherita |
Coal India Office |
R |
79 |
33 |
45 |
Nagaon |
Water resource Div. |
R |
279 |
58 |
7 |
North Lakhimpur Town |
Bazarpatti lakhimpur |
R |
136 |
54 |
40 |
Sibsagar |
Sibasagar Off. Bldg |
R |
156 |
72 |
102 |
Silchar |
Office Building RLO |
R |
102 |
51 |
93 |
Tezpur |
Tezpur Office Bldg |
R |
198 |
192 |
99 |
Tinsukhia |
Digboi carbon factor |
R |
124 |
42 |
18 |
Bihar |
Patna |
Beltron Bhawan |
R |
255 |
123 |
84 |
Gandhi Maidan T C |
R |
477 |
247 |
46 |
Chandigarh |
Chandigarh |
Industrial Area |
I |
185 |
65 |
147 |
Kaimbwala Village |
R |
154 |
52 |
154 |
Punjab Eng College |
R |
156 |
55 |
150 |
Sector-17 C |
R |
158 |
51 |
154 |
Sector-39 |
R |
163 |
53 |
153 |
Chattisgarh |
Bhilai Nagar |
M.P.L.U. Nigam |
I |
271 |
20 |
96 |
Regional Office |
R |
166 |
10 |
94 |
Visak Hostel |
R |
187 |
24 |
92 |
Korba |
I.T.I, Rampur |
R |
259 |
29 |
101 |
Near Ghantaghar |
R |
249 |
29 |
104 |
Pragati Nagar |
R |
227 |
28 |
102 |
Raipur |
Wool Worth I.Pvt.Ltd |
I |
493 |
75 |
41 |
New HIG - 9, Hirapur |
R |
452 |
88 |
51 |
Yatayat Thana |
R |
395 |
64 |
45 |
Dadra & Nagar Haveli |
Silvassa |
Khadoli Ind. Area |
I |
307 |
47 |
78 |
Daman & Diu |
Daman |
Kadaiya Ind. Area |
I |
223 |
37 |
76 |
Delhi |
Delhi |
Mayapuri Indl. Area |
I |
519 |
188 |
96 |
Shahdara |
I |
461 |
133 |
77 |
Shahzada Bagh |
I |
542 |
151 |
77 |
Janakpuri |
R |
510 |
162 |
75 |
N.Y. School |
R |
397 |
151 |
96 |
Nizamuddin |
R |
528 |
178 |
74 |
Pritampura |
R |
423 |
103 |
74 |
Siri Fort |
R |
489 |
151 |
74 |
Town Hall |
R |
536 |
232 |
96 |
Goa |
Mormugao |
Mormugao Port Trust |
I |
158 |
96 |
102 |
Panaji |
Near Old GSPCB |
R |
133 |
48 |
100 |
Vasco |
Electricity Deptt. |
I |
177 |
97 |
78 |
Gujarat |
Ahmedabad |
Naroda |
I |
295 |
59 |
104 |
Shardaban Hospital |
I |
196 |
16 |
97 |
Behrampura |
R |
193 |
19 |
104 |
Cadilla Bridge Narol |
R |
200 |
20 |
102 |
L.D. Eng. College |
R |
185 |
20 |
98 |
R.C. High School |
R |
196 |
16 |
105 |
Anklesvar |
Rallies India Ltd |
I |
196 |
21 |
105 |
Durga Traders |
R |
158 |
12 |
105 |
Jamnagar |
Fisheries Office |
R |
193 |
20 |
105 |
Rajkot |
Sardhara Indl.Corp. |
I |
227 |
36 |
105 |
Regional Office |
R |
157 |
20 |
100 |
Surat |
B.R.C. High School |
I |
202 |
19 |
103 |
Near A.I. Office |
R |
183 |
26 |
103 |
S.V.R. Eng. College |
R |
158 |
13 |
106 |
Vadodara |
CETP |
I |
299 |
41 |
105 |
Dandia Bazar |
R |
186 |
42 |
110 |
GPCB Office |
R |
113 |
19 |
110 |
Vapi |
GEB |
I |
169 |
15 |
98 |
Vapi Nagar Palika |
R |
147 |
9 |
104 |
Haryana |
Faridabad |
HSPCB office, Ballabgard, Faridabad |
R |
343 |
- |
- |
Hisar |
Urban Estate-II |
R |
159 |
32 |
11 |
Yamunanagar |
Ballarpur Industries |
I |
328 |
161 |
31 |
Himachal Pradesh |
Baddi |
AHC |
I |
164 |
67 |
62 |
Industry Department |
I |
171 |
67 |
83 |
Housing Board |
R |
148 |
69 |
30 |
Damtal |
Old Road |
R |
171 |
41 |
91 |
Regional Office |
R |
127 |
45 |
106 |
Nahan |
Industrial Area |
I |
350 |
134 |
154 |
Trilok Pur |
R |
166 |
51 |
160 |
Nalagarh |
M.C. |
R |
178 |
87 |
67 |
Paonta Sahib |
Gondpur Indl. Area |
I |
264 |
83 |
134 |
Paonta Sahib |
R |
168 |
46 |
140 |
Parwanoo |
AC Office Bldg. |
I |
170 |
45 |
126 |
Central Laboratory |
R |
127 |
42 |
128 |
Shimla |
Bus Stand |
R |
128 |
54 |
136 |
Tekka Bench Ridge |
S |
121 |
59 |
131 |
Jammu & Kashmir |
Jammu |
B.Brahmana |
I |
225 |
51 |
38 |
M.A.Stadium |
R |
205 |
62 |
54 |
Regional Office |
R |
211 |
55 |
60 |
Jharkhand |
Dhanbad |
Regional Office |
R |
220 |
109 |
51 |
Jamshedpur |
Bistupur Vehicle TC |
I |
367 |
32 |
103 |
Golmuri Vehical TC |
I |
361 |
29 |
99 |
Jharia |
M.A.D.A. |
I |
336 |
97 |
78 |
Ranchi |
Albert Ekka Chowk |
R |
365 |
126 |
85 |
Sindri |
BIT |
I |
219 |
66 |
71 |
Karnataka |
Bangalore |
Graphite India |
I |
442 |
275 |
97 |
KHB Indl Area |
I |
188 |
103 |
95 |
Peenya Indl. Area |
I |
173 |
67 |
63 |
AMCO Batteries |
R |
178 |
76 |
101 |
R.V.College |
R |
122 |
4 |
6 |
Yeshwanthpura |
R |
513 |
188 |
106 |
Victoria Hospital |
S |
177 |
68 |
98 |
Belgaum |
Karnataka SPCB |
I |
68 |
40 |
78 |
Gulbarga |
Govt. Hospital |
S |
188 |
50 |
99 |
Hassan |
N.R. Circle |
R |
118 |
29 |
107 |
Hubli-Dharwad |
L. Industrial Area |
I |
250 |
85 |
88 |
Rani C. Circle |
R |
220 |
82 |
96 |
Mangalore |
Stides Premises |
I |
87 |
42 |
104 |
Mysore |
K.R. Circle |
R |
108 |
35 |
103 |
KSPCB Building |
I |
80 |
28 |
107 |
Kerala |
Kochi |
Eloor |
I |
102 |
92 |
90 |
FACT Udyogmandal |
I |
114 |
100 |
92 |
Irumpanam |
I |
55 |
26 |
107 |
CSIR Complex |
I |
61 |
27 |
107 |
Ernakulum South |
R |
75 |
33 |
108 |
FCI, OEN C. O. Bldg |
R |
58 |
28 |
108 |
M.G. Road |
R |
60 |
36 |
108 |
Kottayam |
Vadavathoor |
I |
38 |
3 |
96 |
Kottayam |
R |
56 |
8 |
96 |
Kozhikode |
Nallalam |
I |
72 |
16 |
108 |
Kozhikode City |
R |
72 |
17 |
105 |
Palakkad |
Carboradum/SEPR |
I |
126 |
45 |
118 |
Trivandrum |
Hi Tech Chackai |
I |
89 |
14 |
108 |
Sasthamangalam |
R |
62 |
7 |
110 |
SMV School |
R |
73 |
24 |
106 |
Maharashtra |
Aurangabad (MS) |
C.A.D.A. Office |
R |
207 |
63 |
97 |
S.B.E.S. College |
R |
346 |
114 |
98 |
Bibi-Ka-Maqbara |
S |
243 |
69 |
101 |
Chandrapur |
M.I.D.C. |
I |
309 |
166 |
77 |
Nagar Parishad |
R |
174 |
90 |
69 |
SRO, Bapat Nagar |
R |
296 |
193 |
76 |
Kolhapur |
Mahadwar Road |
R |
212 |
58 |
101 |
S.T. Stand |
R |
298 |
99 |
103 |
Shivaji University |
R |
120 |
15 |
105 |
Mahad |
EHS mahad |
I |
234 |
52 |
45 |
MNP, Phulle Hall |
R |
272 |
79 |
38 |
WTP, Bhirwadi |
R |
216 |
61 |
44 |
Mumbai |
Parel |
I |
287 |
129 |
93 |
Kalbadevi |
R |
267 |
111 |
87 |
Worli |
R |
230 |
70 |
94 |
Nagpur |
MIDC Industrial Area/Hingana |
I |
214 |
128 |
94 |
MIDC Office |
I |
165 |
61 |
105 |
Govt. Poly. College |
R |
125 |
48 |
97 |
Institution of Eng. |
R |
142 |
53 |
105 |
Maskasath |
R |
229 |
89 |
98 |
NEERI Lab |
R |
103 |
72 |
92 |
Nashik |
VIP Industrial Area |
I |
146 |
58 |
102 |
NMC Building |
R |
186 |
73 |
103 |
RTO Colony Tank |
R |
159 |
77 |
103 |
Navi Mumbai |
MIDC Taloja |
I |
542 |
216 |
105 |
MPCB Central Lab |
I |
245 |
157 |
104 |
Airoli |
R |
218 |
200 |
102 |
Kharghar |
R |
182 |
151 |
100 |
Nerul |
R |
208 |
183 |
107 |
Panvel Water Works |
R |
236 |
182 |
103 |
Pune |
Bhosari |
I |
212 |
121 |
106 |
Nalstop |
R |
222 |
105 |
103 |
Swargate |
R |
240 |
127 |
110 |
Solapur |
WIT Campus |
I |
238 |
27 |
104 |
Chitale Clinic |
R |
228 |
38 |
105 |
Thane |
Balkum/Kolshet |
I |
102 |
13 |
89 |
Kopri |
R |
87 |
14 |
99 |
Naupada |
R |
94 |
11 |
103 |
Meghalaya |
Byrnihat |
EPIP |
I |
179 |
40 |
44 |
Dawki |
Terrance Building |
R |
69 |
17 |
14 |
Shillong |
Boards Office |
R |
66 |
13 |
82 |
Tuberculosis Hosp. |
R |
134 |
21 |
88 |
Mizoram |
Aizawl |
Bawngkawn |
R |
98 |
21 |
104 |
Khatla |
R |
89 |
20 |
103 |
Laipuitlang |
R |
69 |
15 |
104 |
Madhya Pradesh |
Bhopal |
Govindpura |
I |
279 |
134 |
54 |
Hamidia Road |
R |
403 |
182 |
70 |
T.T.Nagar |
R |
220 |
116 |
73 |
Dewas |
EID Perry (I) Ltd. |
I |
300 |
121 |
95 |
Vikas Nagar |
R |
231 |
112 |
101 |
Gwalior |
Dindayal Nagar |
R |
370 |
92 |
53 |
Maharaj Bada |
R |
197 |
53 |
15 |
Indore |
M.P. Laghu Udyog |
I |
370 |
102 |
44 |
Kothari Market |
R |
314 |
86 |
43 |
Telephone Nagar |
R |
210 |
102 |
94 |
Jabalpur |
Vijay Nagar |
R |
300 |
30 |
94 |
Nagda |
Chem. D. Labour Club |
I |
176 |
21 |
62 |
BCI Labour Club |
R |
155 |
25 |
89 |
Grasim Kalyan Kendra |
R |
171 |
22 |
96 |
Sagar |
Pt. Deendayal Nagar |
R |
253 |
92 |
87 |
Satna |
Sub-Divisional Off. |
I |
376 |
74 |
41 |
Regional Office |
R |
184 |
54 |
26 |
Singrauli |
Jayant Township |
R |
395 |
91 |
7 |
N.T.P.C., Vidyanagar |
R |
270 |
47 |
7 |
Waidhan |
R |
207 |
15 |
7 |
Ujjain |
District Office |
I |
239 |
87 |
76 |
Regional Office |
R |
97 |
43 |
90 |
Mahakal Temple |
S |
124 |
55 |
82 |
Nagaland |
Dimapur |
Bank Colony |
R |
142 |
44 |
45 |
Dhobinala |
R |
146 |
45 |
45 |
Orissa |
Angul |
Industrial Estate |
I |
364 |
108 |
104 |
NALCO Township |
R |
164 |
37 |
84 |
Balasore |
Sahadevkhunta |
R |
183 |
13 |
51 |
Berhampur |
Regional Office |
R |
137 |
64 |
105 |
Bhubaneshwar |
Capital Police Stn. |
R |
190 |
91 |
105 |
IRC |
R |
153 |
59 |
104 |
OSPCB Bldg |
R |
166 |
60 |
112 |
Cuttack |
Badambi, Cuttack |
R |
293 |
105 |
104 |
R.O. Cuttack |
R |
159 |
53 |
105 |
Rayagada |
LPS H. School |
I |
95 |
32 |
105 |
Regional Office |
R |
100 |
35 |
111 |
Rourkela |
IDL Police Out-post |
R |
206 |
31 |
105 |
Regional Office |
R |
207 |
21 |
106 |
Sambalpur |
PHD Ofice, Sambalpur |
R |
137 |
17 |
125 |
Talcher |
Coal Field Area |
I |
274 |
97 |
95 |
T.T.P.S Colony |
I |
212 |
57 |
104 |
Pondicherry |
Pondicherry |
PIPDIC |
I |
70 |
17 |
64 |
Chamber of Commerce |
R |
57 |
14 |
100 |
DSTC Office |
R |
68 |
15 |
61 |
Punjab |
Amritsar |
Nagina Soap Factory |
I |
471 |
49 |
19 |
A-1 Platters |
R |
479 |
49 |
20 |
Bathinda |
Bathinda Milk Plant |
I |
203 |
18 |
113 |
Dera Bassi |
Bhanakarpur Road |
I |
206 |
14 |
132 |
Winsome Yarns Ltd |
I |
206 |
14 |
123 |
Naya Nangal |
NFL Guest House |
R |
209 |
27 |
128 |
Rajasthan |
Alwar |
Gaurav Solvex Ltd. |
I |
325 |
156 |
100 |
RIICO Pump House |
I |
213 |
86 |
102 |
Regional Office |
R |
324 |
143 |
105 |
Jaipur |
MIA |
I |
218 |
115 |
105 |
VKIA |
I |
488 |
180 |
107 |
Ajmeri Gate |
R |
295 |
124 |
105 |
Chandpole |
R |
474 |
135 |
103 |
RSPCB Office |
R |
203 |
98 |
106 |
Vidyadhar Nagar |
R |
384 |
172 |
103 |
Jodhpur |
Basni Indl. Area |
I |
404 |
93 |
88 |
DIC |
I |
337 |
105 |
99 |
Housing Board |
R |
322 |
108 |
83 |
M M Police Thane |
R |
408 |
76 |
103 |
Shashtri Nagar |
R |
363 |
96 |
84 |
Sojati Gate |
R |
415 |
92 |
83 |
Kota |
Regional Office |
I |
240 |
112 |
104 |
Municipal C. Bldg |
R |
176 |
80 |
103 |
Samcore Glass |
R |
216 |
95 |
105 |
Udaipur |
Regional Office, MIA |
I |
240 |
128 |
101 |
Ambamata |
R |
204 |
130 |
97 |
Town Hall |
R |
263 |
97 |
102 |
Tamilnadu |
Chennai |
Govt. High School |
I |
180 |
75 |
94 |
Kathivakkam |
I |
184 |
57 |
94 |
M C Thiruvottiyur |
I |
129 |
46 |
94 |
Thiruvottiyur |
I |
226 |
104 |
94 |
Madras Med. College |
R |
111 |
35 |
90 |
NEERI CSIR Campus |
R |
89 |
39 |
96 |
Coimbatore |
SIDCO Office |
I |
239 |
113 |
88 |
Dist. Coll. Office |
R |
133 |
74 |
94 |
Ponniyarajapuram |
R |
97 |
51 |
91 |
Madurai |
Fenners (I) Ltd. |
I |
83 |
19 |
97 |
Highway Bldg. |
R |
85 |
18 |
97 |
Kunnathur Chatram |
R |
91 |
21 |
94 |
Salem |
Sowdeswari College |
R |
125 |
39 |
132 |
Thoothukudi |
Raja Agencies |
I |
258 |
126 |
91 |
AVM Jewellery Bldg. |
R |
117 |
63 |
95 |
Fisheries College |
R |
167 |
95 |
95 |
Uttar Pradesh |
Agra |
Nunhai |
S |
396 |
78 |
95 |
Regional Office |
S |
349 |
85 |
99 |
DIC, Nunhai |
S |
632 |
250 |
104 |
Itmad-ud-daulah |
S |
408 |
188 |
104 |
Rambagh |
S |
380 |
175 |
103 |
Taj Mahal |
S |
325 |
170 |
266 |
Allahabad |
Bharat Yantra Nigam |
R |
299 |
97 |
102 |
Square Crossing |
R |
430 |
138 |
102 |
Anpara |
Renusagar Colony |
I |
268 |
49 |
90 |
Anpara Colony |
I |
275 |
39 |
87 |
Firozabad |
CDGI |
I |
408 |
145 |
101 |
Raza Ka Tal |
R |
392 |
138 |
95 |
Tilak Nagar |
R |
358 |
129 |
93 |
Ghaziabad |
Atlas Cycles Ltd |
I |
508 |
72 |
78 |
Bulandshahar R.I.A. |
I |
460 |
71 |
74 |
Jhansi |
Jail Chauraha |
R |
288 |
27 |
115 |
Veeranga Nagar |
R |
239 |
29 |
104 |
Kanpur |
Fazal Ganj |
I |
519 |
36 |
83 |
Jajmau |
I |
469 |
67 |
89 |
Dabauli |
R |
481 |
57 |
84 |
Deputy Ka Parao |
R |
490 |
46 |
89 |
Kidwai nagar |
R |
474 |
56 |
92 |
Khurja |
CGCRI |
I |
508 |
18 |
82 |
Ahirpara |
R |
233 |
43 |
80 |
Lucknow |
Talkatora |
I |
437 |
61 |
93 |
Aminabad |
R |
417 |
59 |
94 |
Chandganj Nagar |
R |
405 |
55 |
96 |
Kapoor Hotel |
R |
401 |
55 |
91 |
Mahanagar |
R |
405 |
52 |
78 |
Meerut |
Begum Bridge |
R |
644 |
115 |
41 |
Thana Railway Road |
R |
487 |
46 |
29 |
Noida |
GEE-PEE |
I |
451 |
69 |
98 |
R.O, UPPB |
R |
443 |
65 |
92 |
Varanasi |
Regional Office |
R |
381 |
24 |
89 |
Sigra |
R |
394 |
28 |
94 |
Uttarakhand |
Dehradoon |
Raipur Road |
I |
253 |
58 |
48 |
Clock Tower |
R |
322 |
73 |
57 |
West Bengal |
Asansol |
Asansol M.C. |
I |
350 |
198 |
102 |
Kangsabati Spinning Mill, Barjora |
I |
320 |
194 |
43 |
Burnpur Town Department, Burnpur |
I |
317 |
206 |
43 |
Durgapur |
Dew India Ltd., Dr. B. C. Roy Avenue, Durgapur |
I |
492 |
242 |
102 |
Kwality Hotel, Bhiringi More, benachiti |
I |
366 |
183 |
102 |
PCBL Club, Muchipara, Bidhannagar |
R |
239 |
123 |
102 |
DMC Water Works, Angadpur |
R |
278 |
133 |
43 |
Haldia |
Super Market |
I |
248 |
31 |
9 |
WBIIDC |
I |
251 |
34 |
9 |
Howrah |
Bandhaghat |
I |
247 |
142 |
104 |
Howrah MC |
I |
262 |
152 |
104 |
Bator |
R |
212 |
126 |
104 |
Naskarpara |
R |
232 |
138 |
104 |
Kolkata |
Traffic Guard Building, Behala Chowrasta |
I |
233 |
130 |
105 |
Cossipore Police Stn |
I |
392 |
160 |
97 |
National Sample Survey Building, Dunlop Bridge |
I |
220 |
142 |
104 |
Upanagari Sporting Club, Baishnabghata |
R |
170 |
104 |
105 |
Kasba |
R |
319 |
154 |
95 |
Lal Bazar |
R |
332 |
148 |
96 |
A.J.C Bose Road, Minto Park |
R |
168 |
96 |
104 |
KMC Office Building, Moulali |
R |
223 |
137 |
105 |
CK Market, Salt Lake |
R |
186 |
112 |
105 |
Barrackpore |
Barrackpore Police Station |
R |
223 |
78 |
44 |
Dum Dum Telephone Exchange |
R |
272 |
109 |
44 |
Khardah Municipality |
R |
266 |
109 |
44 |
Raniganj |
Jamuria Municipality |
R |
476 |
173 |
17 |
SKS Public School, Mangalpur |
R |
342 |
232 |
43 |
Raniganj Municipality, Raniganj |
R |
522 |
282 |
43 |
Sankrail |
P. Mukherjee's House, (Near SBI) |
R |
202 |
76 |
31 |
Bagnan Police Station |
R |
282 |
76 |
31 |
Dhulagarh Gram Panchayet Office |
R |
283 |
76 |
31 |
Bharat Co-operative Housing Society, Sankrail |
R |
249 |
61 |
31 |
South suburban |
P. Roy Industrial Training Institute, Amtala |
R |
163 |
163 |
43 |
Baruipur Police Station |
R |
172 |
95 |
43 |
Chanditala Water Supply Pump House, Tollygunge |
R |
200 |
121 |
42 |
Note: R – Residential and other areas, I – Industrial area, S – Sensitive Areas, Std dev. – Standard deviation, n – number of days monitored for 16 and more hours a day |