Table 1.

Typical concentration of fluoride ions found at fluoride‐affected areas in India

S. no.	First author(ref.)	Year	State/location	Fluoride conc. [ppm])
1	N. Subba Rao[ 32 ]	2003	Andhra Pradesh/Guntur	0.60–2.30
2	N. Subba Rao[ 33 ]	2003	Andhra Pradesh/Anantapur	0.56–5.80
3	P. D. Sreedevi[ 34 ]	2006	Andhra Pradesh	0.38–4.00
4	D. Sujatha[ 35 ]	2003	Andhra Pradesh/Ranga Reddy	0.40–4.80
5	J. Dutta[ 36 ]	2010	Assam/Sonitpur	0.17–5.60
6	N. J. Raju[ 37 ]	2009	Uttar Pradesh/Sonbhadra	0.48–6.70
7	P. Sharma[ 38 ]	2012	Assam/Nalbari	0.02–1.56
8	S. Ramanaiah[ 39 ]	2006	Andhra Pradesh/Prakasam	0.50–9.0
9	S. Gupta[ 40 ]	2006	West Bengal/Birbhum	0.01–1.95
10	Meenakshi[ 41 ]	2004	Haryana/Jind	0.3–6.9
11	G. Karthikeyan[ 42 ]	2000	Tamil Nadu/Dharmapuri	0.98–5.60
12	P. Kotecha[ 43 ]	2012	Gujarat/Vadodara	0.02–4.17
13	N. Sankararamakrishnan[ 44 ]	2008	Uttar Pradesh/Kanpur	>1.5
14	C. R. Ramakrishnaiah[ 45 ]	2009	Karnataka/Tumkur	0.02–3.2
15	A. Shivashankara[ 46 ]	2000	Karnataka/Gulbarga	0.6–13.4
16	G. Viswanathan[ 47 ]	2010	Tamil Nadu/Dindigul	0.76–3.17
17	M. Bishnoi[ 48 ]	2007	Haryana/Rohtak	0.03–2.09
18	D. V. Reddy[ 49 ]	2010	Telangana/Nalgonda	0.50–7.00
19	D. R. R. Sarma[ 50 ]	1997	Andhra Pradesh/Visakhapatnam	0.24–8.10
20	S. K. Jha[ 51 ]	2010	Uttar Pradesh/Unnao	0.8–13.9
21	M. Arif[ 52 ]	2012	Rajasthan/Nagaur	0.4–6.6
22	S. Yadav[ 53 ]	2011	Uttar Pradesh/Rampur	0.32–1.80
23	P. Kotoky[ 54 ]	2010	Assam/Karbi Anglong	0.95–20.60
24	A. C. Samal[ 55 ]	2015	West Bengal/Purulia	0.01–1.6
25	H. Pauwels[ 56 ]	2015	Andhra Pradesh/Maheshwaram	0.26–3.73
26	K. S. Patel[ 57 ]	2017	Chhattisgarh/Rajnandgaon	3.7–27
27	S. Manikandan[ 58 ]	2014	Tamil Nadu/Krishnagiri	0.50–5.45